EN 12622-2009 - Safety of machine tools - Hydraulic press brakes

Prévia do material em texto

EUROPEAN STANDARD 
NORME EUROPÉENNE 
EUROPÄISCHE NORM 
 
 EN 12622 
 
 
 November 2009 
ICS 25.120.10 Supersedes EN 12622:2001
English Version 
 Safety of machine tools - Hydraulic press brakes 
Sécurité des machines-outils - Presses plieuses 
hydrauliques 
 Sicherheit von Werkzeugmaschinen - Hydraulische 
Gesenkbiegepressen 
This European Standard was approved by CEN on 17 October 2009. 
 
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European 
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national 
standards may be obtained on application to the CEN Management Centre or to any CEN member. 
 
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation 
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the 
official versions. 
 
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, 
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. 
 
 
 
 
 
EUROPEAN COMMITTEE FOR STANDARDIZATION 
C O M I T É E U R O P É E N D E N O R M A LI S A T I O N 
EUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG 
 
 
Management Centre: Avenue Marnix 17, B-1000 Brussels 
© 2009 CEN All rights of exploitation in any form and by any means reserved 
worldwide for CEN national Members. 
Ref. No. EN 12622:2009: E
EN 12622:2009 (E) 
2 
Contents Page 
Foreword ..............................................................................................................................................................4
Introduction .........................................................................................................................................................5
1 Scope ......................................................................................................................................................6
2 Normative references ............................................................................................................................6
3 Terms, definitions and abbreviations ..................................................................................................9
3.1 Terms and definitions ...........................................................................................................................9
3.2 Abbreviations ...................................................................................................................................... 12
4 List of significant hazards ................................................................................................................. 12
5 Safety requirements and/or measures ............................................................................................. 15
5.1 Protection of mechanical hazards .................................................................................................... 15
5.1.1 Description of the safeguarding of access to moving parts .......................................................... 15
5.1.1.1 General ......................................................................................................................................... 15
5.1.1.2 Fixed enclosing guards .............................................................................................................. 15
5.1.1.3 Interlocking guards with or without guard locking ................................................................. 15
5.1.1.4 ESPE using AOPD ....................................................................................................................... 16
5.1.1.5 Laser actuated AOPD ................................................................................................................. 20
5.1.1.6 Hold to run control ...................................................................................................................... 22
5.1.1.7 Scanner systems ......................................................................................................................... 22
5.1.1.8 ESPE using AOPD when used in automatic cycle as a trip device ....................................... 23
5.1.2 Location of the safeguarding of access to moving parts ............................................................... 24
5.1.2.1 Prevention of access from the front.......................................................................................... 24
5.1.2.2 Prevention of access from the sides ........................................................................................ 25
5.1.2.3 Prevention of access from the rear ........................................................................................... 25
5.2 Control systems .................................................................................................................................. 26
5.2.1 General ................................................................................................................................................. 26
5.2.2 Manual control devices ...................................................................................................................... 26
5.2.3 Failure of power supply ..................................................................................................................... 26
5.2.4 Protection against external influences ............................................................................................. 26
5.2.5 Safety functions .................................................................................................................................. 26
5.2.5.1 General ......................................................................................................................................... 26
5.2.5.2 Behaviour of the control system in case of failure .................................................................. 33
5.2.5.3 Stop or hold to stop closing stroke of the beam ..................................................................... 34
5.2.5.4 Stop back gauges........................................................................................................................ 34
5.2.5.5 Back gauges movement limitation ............................................................................................ 34
5.2.5.6 Stop work-piece support movement ......................................................................................... 35
5.2.5.7 Slow speed ................................................................................................................................... 35
5.2.5.8 Muting ........................................................................................................................................... 35
5.2.5.9 Blanking ....................................................................................................................................... 36
5.2.5.10 Emergency stop .......................................................................................................................... 36
5.2.5.11 Mode selection ............................................................................................................................ 36
5.2.5.12 Single stroke function ................................................................................................................ 37
5.2.6 Other functions ................................................................................................................................... 37
5.2.6.1 Start ..............................................................................................................................................37
5.2.6.2 Restart .......................................................................................................................................... 37
5.2.6.3 Reset ............................................................................................................................................. 38
5.2.6.4 Normal stop ................................................................................................................................. 38
5.2.7 Use of electronic components .......................................................................................................... 38
5.2.7.1 Access to the NC program ......................................................................................................... 38
5.2.7.2 Use of PES for safety functions ................................................................................................. 38
5.3 Mode of operation ............................................................................................................................... 39
5.3.1 Description of the various modes of operation ............................................................................... 39
5.3.2 Setting mode ....................................................................................................................................... 39
5.3.3 Production modes .............................................................................................................................. 39
5.3.3.1 Single cycle manual load and/or unload .................................................................................. 39
EN 12622:2009 (E) 
3 
5.3.3.2 Automatic cycle with automatic load and unload .................................................................... 40
5.4 Basic design considerations .............................................................................................................. 40
5.4.1 Stability ................................................................................................................................................. 40
5.4.1.1 Prevention of unintended gravity fall of the beam (down stroking press brakes) ................ 40
5.4.1.2 Stability of the press brake ......................................................................................................... 40
5.4.1.3 Stability of the work piece ........................................................................................................... 40
5.4.2 Risk of break up during operation ..................................................................................................... 40
5.4.3 Tool holder and tool design ............................................................................................................... 41
5.4.4 Access to raised work stations or platforms .................................................................................... 41
5.4.5 Slips, trips and falls ............................................................................................................................. 41
5.4.6 Release of trapped persons ............................................................................................................... 41
5.4.7 Guarding of drives, transmission machinery and ancillary devices .............................................. 41
5.5 Protection against non-mechanical hazard ...................................................................................... 42
5.5.1 Noise ..................................................................................................................................................... 42
5.5.2 Electrical hazards ................................................................................................................................ 43
5.5.3 Ergonomic and handling..................................................................................................................... 43
5.5.4 Hydraulic and pneumatic systems .................................................................................................... 43
5.5.4.1 General .......................................................................................................................................... 43
5.5.4.2 Valves ............................................................................................................................................ 44
5.5.4.3 Hydraulic systems ....................................................................................................................... 44
5.5.5 Thermal hazards .................................................................................................................................. 45
5.5.6 Hazards generated by materials and substances ............................................................................ 45
5.5.7 Hazards generated by lasers .............................................................................................................. 45
5.5.8 High pressure fluid ejection hazards ................................................................................................. 45
5.5.9 Isolation and energy dissipation ........................................................................................................ 45
5.5.10 Maintenance ......................................................................................................................................... 45
5.5.11 Errors of fitting ..................................................................................................................................... 45
6 Verification of the safety requirements and/or protective measures ............................................. 46
7 Information for use .............................................................................................................................. 48
7.1 Marking ................................................................................................................................................. 48
7.2 Instruction handbook .......................................................................................................................... 49
7.3 Commercial informations ................................................................................................................... 50
Annex A (normative) Calculation of minimum safety distances .................................................................. 51
Annex B (normative) The overall response time of the press brake stopping performance .................... 53
Annex C (informative) Example of redundant and monitored hydraulic control circuits for a down-
stroking press brake ........................................................................................................................... 54
Annex D (normative) Conditions for noise measurement of press brakes ................................................ 55
Annex E (informative) Side safeguarding for manually fed press brakes ................................................... 56
Annex F (informative) Markings ....................................................................................................................... 57
Annex G (normative) Laser actuated AOPD system tests ............................................................................ 58
Annex H (informative) Bending speed ............................................................................................................ 59
Annex ZA (informative) Relationship between this European Standard and the Essential Requirements 
of EU Directive 2006/42 ....................................................................................................................... 61
Bibliography ...................................................................................................................................................... 62
 
EN 12622:2009 (E) 
4 
Foreword 
This document (EN 12622:2009) has been prepared by TechnicalCommittee CEN/TC 143 “Machine tools - Safety”, 
the secretariat of which is held by SNV. 
This European Standard shall be given the status of a national standard, either by publication of an identical text or 
by endorsement, at the latest by May 2010, and conflicting national standards shall be withdrawn at the latest by 
May 2010. 
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. 
CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. 
This document supersedes EN 12622:2001. 
This document has been prepared under a mandate given to CEN by the European Commission and the European 
Free Trade Association, and supports essential requirements of EU Directive(s). 
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. 
This European Standard constitutes a revision of EN 12622:2001 for which it has been technically revised. The 
main modifications are listed below: 
 complete reorder of Clause 5 "Safety requirements and/or measures"; 
 description of safety functions and its safety related part of control systems with categories assignated and /or 
performance levels required (see Tables 2 and/or 3); 
 addition of subclause 5.2.7 on the use of programmable electronic components (PES); 
 addition of subclause 5.3.3 concerning production mode; 
 addition of new safety functions and new safety devices: a stop work-piece support movement (see 5.2.5.6), 
monitoring of slow speed (see 5.2.5.7), laser actuated AOPD (see 5.1.1.5), AOPDDR scanner systems (see 
5.1.1.7.1) and ESPE using AOPD used in automatic cycle as a trip device (see 5.1.1.8). 
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following 
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, 
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, 
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, 
Switzerland and the United Kingdom. 
 
EN 12622:2009 (E) 
5 
Introduction 
This European Standard is a C type standard as defined in EN ISO 12100-1:2003. 
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are 
indicated in the scope of this standard. When provisions of this C type standard are different from those which are 
stated in A or B standards, the provision of this C type standard take precedence over the provisions of the other 
standards for machines that have been designed and built according to the provisions of this C type standard. 
In addition, press brakes comply as appropriate with EN ISO 12100-1 and EN ISO 12100-2 for hazards which are 
not covered by this standard. 
The requirements of this European Standard concern designers, manufacturers, suppliers and importers of 
machines described in the scope. 
This European Standard also includes information to be provided by the manufacturer to the user. 
EN 12622:2009 (E) 
6 
1 Scope 
This European Standard specifies technical safety requirements and protective measures to be adopted by 
persons undertaking the design, manufacture and supply of hydraulic press brakes which are designed to work 
cold metal or material partly of metal and hereafter referred to as machines. 
This European Standard also covers hydraulic press brakes, whose primary intended use is the cold working of 
metal, which are to be used in the same way to work other sheet materials such as cardboard or plastic. 
The requirements in this European Standard take account of intended use, including foreseeable misuse as 
defined in 3.22 of EN ISO 12100-1:2003. This European Standard presumes access to the press brake from all 
directions, deals with the hazards described in Clause 4, and specifies the safety measures for both the operator 
and other exposed persons. 
This European Standard also applies to: 
 ancillary devices which are an integral part of the press brake, e.g. back gauges and adjustable front sheet 
supports; 
 machines which are integrated into an automatic production line where the hazards and risk arising are 
comparable to those of machine working separately. 
The requirements of this European Standard apply to all hydraulic press brakes whatever the technology used in 
their control system, e.g. electromechanical and/ or electronic. 
This European Standard does not apply to machines whose principal designed purpose is: 
a) sheet folding by rotary action; 
b) tube and pipe bending by rotary action; 
c) roll bending. 
This European Standard applies to machines built after the date of issue of this European Standard. 
This European Standard does not cover the safety aspect of automatic loading and unloading equipment. 
Some guidance how to take into account additional automatic loading and unloading equipment can be found in 
ISO 11161. 
2 Normative references 
The following referenced documents are indispensable for the application of this document. For dated references, 
only the edition cited applies. For undated references, the latest edition of the referenced document (including any 
amendments) applies. 
EN 349, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body 
EN 574:1996, Safety of machinery — Two-hand control devices — Functional aspects — Principles for design 
EN 614-1, Safety of machinery — Ergonomic design principles — Part 1: Terminology and general principles 
EN 894-1, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — 
Part 1: General principles for human interactions with displays and control actuators 
EN 894-2, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 
2: Displays 
EN 894-3, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — 
Part 3: Control actuators 
EN 12622:2009 (E) 
7 
EN 953:1997, Safety of machinery — Guards — General requirements for the design and construction of fixed and 
movable guards 
EN 954-1, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design 
EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components — 
Hydraulics 
EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components — 
Pneumatics 
EN 999:1998, Safety of machinery — The positioning of protective equipment in respect of approach speeds of 
parts of the human body 
EN 1005-1, Safety of machinery — Human physical performance — Part 1: Terms and definitions 
EN 1005-2, Safety of machinery — Human physical performance — Part 2: Manual handling of machinery and 
components parts of machinery 
EN 1005-3, Safety of machinery — Human physical performance — Part 3: Recommended force limits for 
machinery operation 
EN 1005-4, Safety of machinery — Human physical performance — Part 4: Evaluation of working postures and 
movements in relation to machinery 
EN 1037:1995, Safety of machinery — Prevention of unexpected start-up 
EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — Principles for design and 
selection 
EN 1837, Safety of machinery — Integral lighting of machines 
EN 50370-1, Electromagnetic compatibility (EMC) — Product family standard for machine tools — Part 1: Emission 
EN 50370-2, Electromagnetic compatibility (EMC) — Product family standard for machine tools — Part 2: Immunity 
EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 
60204-1:2005, modified) 
EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989). 
EN 60825-1:2007, Safety of laser products — Part 1: Equipment classificationand requirements 
(IEC 60825-1:2007) 
EN 60947-5-1:2004, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and switching 
elements — Electromechanical control circuit devices (IEC 60947-5-1:2003) 
EN 60947-5-3, Low-voltage switchgear and controlgear — Part 5-3: Control circuit devices and switching elements 
— Requirements for proximity devices with defined behaviour under fault conditions (PDF) 
(IEC 60947-5-3:1999) 
EN 61310-2, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for marking 
(IEC 61310-2:2007) 
EN 61496-1:2004, Safety of machinery — Electro-sensitive protective equipment — Part 1: General requirements 
and tests (IEC 61496-1:2004, modified) 
EN 62061:2005, Safety of machinery — Functional safety of safety-related electrical, electronic and programmable 
electronic control systems (IEC 62061:2005) 
EN ISO 3744:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994) 
EN 12622:2009 (E) 
8 
EN ISO 3746:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure — 
Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995) 
EN ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and equipment 
(ISO 4871:1996) 
EN ISO 9614 (all parts), Acoustics — Determination of sound power levels of noise sources using sound intensity 
(ISO 9614) 
EN ISO 11202:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound 
pressure levels at a work station and at other specified positions — Survey method in situ (ISO 11202:1995) 
EN ISO 11688-1:1998, Acoustics — Recommended practice for the design of low-noise machinery and equipment 
— Part 1: Planning ((ISO/TR 11688-1:1995) 
EN ISO 11688-2, Acoustics — Recommended practice for the design of low-noise machinery and equipment — 
Part 2: Introduction to the physics of low-noise design (ISO/TR 11688-2:1998) 
EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic 
terminology, methodology (ISO 12100-1:2003) 
EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical 
principles (ISO 12100-2:2003) 
EN ISO 13732-1, Ergonomics of the thermal environment — Methods for the assessment of human responses to 
contact with surfaces — Part 1: Hot surfaces (ISO 13732-1:2006) 
EN ISO 13849-1:2008, Safety of machinery — Safety-related parts of control systems — Part 1: General principles 
for design (ISO 13849-1:2006) 
EN ISO 13849-2, Safety of machinery — Safety-related parts of control systems — Part 2: Validation ((ISO 13849-
2:2003) 
EN ISO 13850, Safety of machinery — Emergency stop — Principles for design (ISO 13850:2006) 
EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by the upper 
and lower limbs (ISO 13857:2008) 
EN ISO 14121-1, Safety of machinery — Risk assessment — Part 1: Principles (ISO 14121-1:2007) 
EN ISO 14122-1, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of fixed 
means of access between two levels (ISO 14122-1:2001) 
EN ISO 14122-2, Safety of machinery — Permanent means of access to machinery — Part 2: Working platforms 
and walkways (ISO 14122-2:2001) 
EN ISO 14122-3, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs, stepladders 
and guard-rails (ISO 14122-3:2001) 
EN ISO 14122-4, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders (ISO 
14122-4:2004) 
EN ISO 14738, Safety of machinery — Anthropometric requirements for the design of workstations at machinery 
(ISO 14738:2002) 
CLC/TS 61496-2:2006, Safety of machinery — Electro-sensitive protective equipment — Part 2: Particular 
requirements for equipment using active opto-electronic protective devices (AOPDs) (IEC 61496-2:2006) 
CLC/TS 61496-3, Safety of machinery — Electro-sensitive protective equipment — Part 3: Particular requirements 
for Active Opto-electronic Protective Devices responsive to Diffuse Reflection (AOPDDR) 
 
EN 12622:2009 (E) 
9 
3 Terms, definitions and abbreviations 
3.1 Terms and definitions 
For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003 and the following apply. 
3.1.1 
beam 
main reciprocating press brake member which normally holds the punch on a down-stroking press brake, and 
which normally holds the die on an up-stroking press brake 
3.1.2 
blanking 
optional function that permits an object of a size greater than the detection capability of the ESPE to be located 
within the detection zone without causing an OFF-state of the OSSD(s) 
[EN 61496-1:2004, definition 3.1] 
NOTE 1 Fixed blanking is a technique wherein the locations of the blanked areas of the detection zone do not change during 
operation. The detection capability of the other parts of the detection zone remains unchanged. 
NOTE 2 Floating blanking is a technique wherein the blanked area of the detection zone follows the location of a moving 
object(s) during operation. The detection capability of the other areas remains unchanged. 
3.1.3 
automatic cycle 
operating mode where the operating cycle is repeated continuously or intermittently, all functions achieved without 
manual intervention after initiation 
3.1.4 
operating cycle 
movement completed by the moving part of the tools from the cycle start position to the bottom dead centre and 
back to the cycle stop position 
NOTE 1 The operating cycle includes all operations carried out during this movement. 
NOTE 2 Normally, the cycle start and stop position is the top dead center. 
3.1.5 
single cycle 
operating mode where each operating cycle of the beam has to be positively actuated by the operator 
3.1.6 
dead centre(s) 
point at which the tool, during its travel, is either nearest/closest to the die (generally it corresponds to the end of 
the closing stroke), known as the bottom dead centre, or furthest from the die (generally it corresponds to the end 
of the opening stroke), known as the top dead centre 
NOTE On an up stroking press brake, the centres are reversed. 
3.1.7 
hydraulic press brake 
machine designed or intended to transmit energy to the moving part of the tools by hydraulic means principally for 
the purpose of bending between narrow forming tools along straight lines 
NOTE See Figure 1. 
EN 12622:2009 (E) 
10 
3.1.8 
overall system stopping performance 
overall response time 
overall stopping distance 
time/distance occurring from actuating the protective device to the cessation of hazardous motion, or to the 
machine assuming a safe condition 
3.1.9 
position switch 
switch which is operated by a moving part of the machine when this part reaches or leaves a predetermined 
position 
3.1.10 
restraint valve 
device which protects against a gravity fall of the beam 
3.1.11 
single stroke function 
feature used to limit the motion of the tool to one operating cycle even if the stroke initiating means (e.g. a pedal) is 
held in the operating position 
3.1.12 
tools 
combination of punch and die 
3.1.13 
up-stroking press brake 
press brake in which the lower tool moves upwards during the closing stroke 
NOTE The movement is reciprocal to a down-stroking press, see Figure 1. 
 
Key 
1 Press cylinder 6 Backgauge 11 Side safeguard 
2 Control panel 7 Hydraulic system 12 Light Curtain 
3 Electrical Switch Gear Cabinet 8 Beam 13 Frame 
4 Foot pedal 9 Tools 
5 Work-piece support 10 Bed 
Figure 1 — Example of a down-stroking hydraulic press brake 
EN 12622:2009 (E) 
11 
3.1.14 
down-stroking press brake 
press brake in which the upper tool moves downwards during the closing stroke 
3.1.15 
programmable electronic system 
PES 
system for control, protection or monitoring basedon one or more programmable electronic devices, including all 
elements of the system such as power supplies, sensors and other input devices, data highways and other 
communication paths, and actuators and other output devices 
[EN 61508-4:2001, definition 3.3.2] 
3.1.16 
electro-sensitive protective equipment 
ESPE 
assembly of devices and/or components working together for protective tripping or presence-sensing purposes 
comprising 
 a sensing device; 
 controlling monitoring devices; 
 output devices and all interconnecting wiring. 
[EN 61496-1:2004, definition 3.5] 
NOTE For the purposes of this European Standard, ESPE covers AOPD, AOPDDR, laser actuated AOPD. 
3.1.17 
light curtain 
active opto-electronic protective device (AOPD) comprising an integrated assembly of one or more emitting 
element(s) and one or more receiving element(s) forming a detection zone with a detection capability specified by 
the supplier 
[CLC/TS 61496-2:2006, definition 3.205] 
3.1.18 
output signal switching device 
OSSD 
component of the electro-sensitive protective device (ESPE) connected to the machine control system which, when 
the sensing device is actuated during normal operation, responds by going to the OFF-state 
[EN 61496-1:2004, definition 3.19] 
3.1.19 
safety-related parts of the control system 
parts (mechanical, hydraulic, electrical, pneumatic) of a control system whose failure can result in a hazard 
3.1.20 
single break cycle initiation 
initiation of the single operating cycle of the beam by actuating the light curtain by an object (e.g. work material, 
hand) and subsequently withdrawing the object from the detection zone of the curtain 
3.1.21 
double break cycle initiation 
initiation of the single operating cycle of the beam by twice in succession disturbing (actuating) the light curtain by 
an object (e.g. work material, hand) and subsequently withdrawing the object from the detection zone of the curtain 
3.1.22 
overrun 
movement (distance) of the beam past a defined stopping point 
EN 12622:2009 (E) 
12 
3.1.23 
overrun monitoring device 
device which provides a signal to inhibit further complete stroke when the overrun exceeds the pre-set limit(s) 
3.1.24 
bending plane 
vertical plane passing through the first contact line with the material from the upper tool nearest to the operator 
3.2 Abbreviations 
TDC Top Dead Centre 
AOPD Active Opto-electronic Protective Device 
NC Numerical Control 
AOPDDR Active Opto-electronic Protective Device responsive to Diffuse Reflection (Scanner) 
PLC Programmable logic controller 
PES Programmable electronic system 
ESPE Electro-sensitive protective equipment 
OSSD Output signal switching device 
4 List of significant hazards 
This clause contains the significant and other relevant hazards, hazardous situations and events (see 
EN ISO 14121-1) as far as they are dealt with in this European Standard, identified by risk assessment as 
significant for the machines as defined in the scope and which require action to eliminate or reduce the risk. This 
European Standard deals with: 
 significant hazards by defining safety requirements and/ or measures or by reference to relevant type B 
standards; 
 hazards which are present but not significant e.g. general, minor or secondary hazards by reference to 
EN ISO 12100-1:2003 and EN ISO 12100-2:2003. 
These hazards are listed in Table 1 in accordance with EN ISO 14121-1. 
Particular attention is given to hazards dealing with: 
 crushing and shearing between moving tools, beam, back gauges, work-piece supports (see Table 1); 
 entanglement on or drawing into moving parts of the machine, guards, motor and drive machinery, mechanical 
handling device (see Table 1); 
 ejection of machine components of hydraulic system (see Table 1). 
Main danger zones are: 
 tools area with moving beam, back gauges, work-piece supports; 
 mechanical handling device; 
 motor and drive machinery. 
 
EN 12622:2009 (E) 
13 
Table 1 — Overview of hazards and reference to B-Type Standards 
Annex A of 
EN ISO 
14121-1 
Hazards, hazardous 
situations and hazardous 
events 
Situations on 
hydraulic press breaks 
EN ISO 12100- 
Relevant type B 
standard 
Relevant clause 
in this 
International 
Standard 
Part 1: 
2003 
Part 2: 
2003 
1 Mechanical hazards 5 
A.1 Acceleration, deceleration (kinetic energy) 
4.2 
4.2.1 
4.2.2 
4.2.3 
4.10 
4.2.1 
4.2.2 
4.3 a) 
4.3 b) 
4.6 
4.10 
5.1 
5.2 
5.3 
5.5.2 
5.5.4 
5.5.5 
5.5.6 
6.1 
6.3 
6.4 
6.5 
ISO 13851 
ISO 13854 
ISO 13855 
ISO 13856-2 
ISO 13856-3 
EN ISO 13857 
ISO 14118 
ISO 14119 
ISO 14120 
EN ISO 14122-1 
EN ISO 14122-2 
EN ISO 14122-3 
EN ISO 14122-4 
ISO 16156 
EN 60204-1 
EN 614-1 
5.1.1 
5.2.6.4 
5.2.5.11 
5.4.1 
5.4.2 
5.4.3 
5.4.5 
5.4.7 
5.5.4 
5.5.5 
5.5.6 
5.5.8 
A.1 
Approach of a moving 
element to a fixed part 
A.1 
Cutting parts, sharp edges: 
crushing and shearing 
A.1 
Elastic elements 
High pressure: fluid 
injection or ejection 
Vacuum, 
Gravity (stored energy) 
Dissipation of accumulated 
energy inside the machine 
A.1 Falling of objects Falling of work-piece 
A.1 
Moving elements: 
Entanglement 
A.1 
Rotating elements: 
Entanglement 
A.1 
Rough, slippery surface: 
slipping, tripping and falling 
of persons (related to 
machinery) 
Ejection or spillage of 
hydraulic fluid. Fall of 
persons during access to/or 
at/from the work position 
machines during setting and 
operation mode. 
A.1 
Stability 
Height from the ground 
Loss of stability 
A.3 Assembly and installation Error of fitting 
During tool workpiece 
clamping change 5.3. a) 
6.1.2 
6.5.1 
5.2.6.2 
5.5.3 
7 
A.3 Operation 
Restarting the machine after 
stopping/interruption 
5.3 b) 
2) 
4.11.4
4.11.5 
ISO 14118 
EN 60204-1 
EN 982 
EN 983 
A.3 Fault finding and troubleshooting 
Isolation and 
energy dissipation 4.2.2 4.10 
ISO 4413 
ISO 4414 
ISO 14118 
EN 60204-1 
2 Electrical hazards 
A.1 Live parts (direct contact) 
At electrical equipment 
during maintenance. 
4.3 
4.9 
5.2 
5.3.2 
5.5.4 
6.4 
6.5 
EN 60204-1 
5.2.3 
5.4.2 
5.5.2 
5.5.9 
A.1 
Parts which have become 
live under fault conditions 
(indirect contact) 
At electrical equipment 
during setting, machining 
and maintenance. 
A.1 
Short-circuit, break up 
during operation 
At any mode of operation, in 
case of penetration of 
conducting substances. 
EN 12622:2009 (E) 
14 
Table 1 (continued) 
Annex A of 
EN ISO 
14121-1 
Hazards, hazardous 
situations and hazardous 
events 
Situations on 
hydraulic press breaks 
EN ISO 12100- 
Relevant type B 
standard 
Relevant clause 
in this 
International 
Standard 
Part 1: 
2003 
Part 2: 
2003 
A.4 Failure of control system 
– dropping or ejection of 
 moving parts of the 
 machine or of a work- 
 piece clamped by the 
 machine 
– failure to stop moving 
 parts 
– uncontrolled movements 
 (including speed 
 change) 
– unintended/unexpected 
 start up 
– other hazardous events 
 due to failure(s) or poor 
 design of the control 
 system 
– variation of speed of 
 tools (during setting) 
5.3 b) 
2) 
4.2 
4.3 
4.5 
4.11 to 
4.13 
5.5.2 
to 
5.5.4 
6.3 to 
6.5 
ISO 4413 
ISO 4414 
EN 954-1 
EN ISO 13849-1 
EN ISO 13849-2 
ISO 14118 
EN 982 
EN 983 
EN 60204-1 
EN 62061 
5.2.7 
3 Thermal hazards 
A.1 
Objects or materials with a 
high temperature 
At hot tools, machine parts 
and workpiece. 4.4 
EN 13487 
EN ISO 13732-1 
5.5.5 
4 Noise hazards 
A.1 Operating process At any mode of operation or in maintenance situation 4.5 4.2.2 
ISO 8525 
ISO 230-5 
EN ISO 11688-1 
5.5.1 
6 Radiation hazards 
A.1 
Low frequency 
electromagnetic radiation 
Radio frequency 
electromagnetic radiation 
At any mode of operation or 
in maintenance situation 
4.7 
4.2.2 
4.3 c) 
5.3.2.1
5.4.5 
6.5.1 
c) 
 
5.1.1 
5.2 
5.3.3.1.2 
5.5.2 
5.5.7 A.1 
Optical radiation (infrared, 
visible and ultraviolet), 
including laser 
At any mode of operationor 
in maintenance situation EN 60825-1 
8 Ergonomic hazards 
A.1 
Design or location of 
indicators and visual 
displays units 
At operators position 
4.9 
4.2.1 
4.7, 
4.8 
4.11.8
5.2.1 
5.3.2.1 
EN 547-1 
EN 547-2 
EN 894-1 
EN 849-2 
EN 849-3 
5.5.3 
7 
A.1 
Design, location or 
identification of control 
devices 
At operators position 
A.1 Posture, Effort 
At control devices and 
during handling of workpiece 
tools and machine parts. 
EN 894-1 
EN 849-2 
EN 849-3 
EN 1005-1 
EN 1005-2 
EN 1005-3 
A.1 Repetitive activity 
Inadequate consideration of 
hand arm or foot-leg 
anatomy at workpiece or 
tool exchange. 
EN 614-1 
EN 614-2 
EN 894-1 
EN 849-2 
EN 849-3 
EN 1005-1 
EN 1005-2 
EN 1005-3 
EN 12622:2009 (E) 
15 
Table 1 (end) 
Annex A of 
EN ISO 
14121-1 
Hazards, hazardous 
situations and hazardous 
events 
Situations on 
hydraulic press breaks 
EN ISO 12100- 
Relevant type B 
standard 
Relevant clause 
in this 
International 
Standard 
A.1 Visibility, Local lighting 
At any mode of operation or 
in maintenance situation EN 1837 
9 Hazards associated with environment in which the machine is used 
A.1 Electromagnetic disturbances 
At NC control equipment 
during all modes of 
operation and maintenance 
5.3 b) 
2) 
4.12.1
6.5.1 
b) 
 
5.2 
5.5.2 
A.4 Human errors human behaviour 
Workstation and/or 
work process design. 
Inadequate consideration of 
hand- arm or 
foot-leg anatomy 
4.9 
4.2.1 
4.7 
4.8 
4.11 
5.5 
6.3 to 
6.6 
EN 894-1 
EN 849-2 
EN 849-3 
5.2.2 
5.2.5.11 
5.3.11 
5 Safety requirements and/or measures 
5.1 Protection of mechanical hazards 
5.1.1 Description of the safeguarding of access to moving parts 
5.1.1.1 General 
The major danger zones at hydraulic press brakes are the tools, associated area and ancillary loading and 
unloading devices which are an integral part of the machine. Preventive measures shall be taken to deal with 
the relevant hazards. 
Safeguarding measures described in EN ISO 12100-1 and EN ISO 12100-2 which are appropriate for the 
protection of any operator at the tools are listed below. Designers, manufacturers and suppliers shall select 
the safeguarding methods which reduce the risks as far as possible, considering the significant hazards (see 
Table 1) and the mode of production. 
The selected combination of safeguarding methods shall protect all exposed persons, i.e. those who can gain 
access to the danger zone during operation, setting, maintenance, cleaning and inspection activities. 
Access to the danger zone(s) shall be prevented by one or a combination of the following safeguarding 
measures. 
5.1.1.2 Fixed enclosing guards 
Fixed enclosing guards shall comply with EN 953. They shall be firmly secured to the machine, another rigid 
structure or the floor. Any openings in the guards or between the guard and the machine shall meet the 
requirements of EN ISO 13857:2008, Table 4. 
5.1.1.3 Interlocking guards with or without guard locking 
Interlocking guards shall comply with EN 953 and prevent, in conjunction with fixed guards, access to the 
danger zone, during any dangerous movement. Initiation of the dangerous movement shall be prevented until 
the guard is closed. The associated interlocking devices shall be designed and constructed in accordance with 
6.2.1 of EN 1088:1995, for occasional access and with 6.2.2 of EN 1088:1995, for frequent access 
Interlocking guards without guard locking shall be placed in such a position that the operator does not have 
time to reach the danger zone before any dangerous movement has ceased (see EN 999 and EN ISO 13857). 
EN 12622:2009 (E) 
16 
5.1.1.4 ESPE using AOPD 
5.1.1.4.1 Light curtain 
ESPE using AOPDs in the form of light curtain shall comply with the following: 
a) light curtains shall be in accordance with EN 61496-1 and be designed and constructed according to 
CLC/TS 61496-2; 
b) access to the danger zone shall only be possible through the detection zone of the light curtain. Additional 
safeguarding shall prevent access to the danger zone from any other direction; 
c) an additional safeguarding shall be provided to ensure that no hazardous movement is possible when 
standing in position between the light curtain and the danger zone of the press brake. The gap shall be 
equal to or less than 75 mm (see 5. 1.1.4.2); 
d) it shall not be possible to initiate any dangerous movement while any part of the body is interrupting the 
light curtain, except when using automatically alternating safeguarding methods (see 5.1.1.4.3); 
e) the means of resetting shall be positioned so that there is a clear view of the whole hazardous zone. 
When more than one hazardous zone is protected with a protective device, a reset control device shall be 
provided for each protective device. For the requirements of the resetting function, see 5.2.2 of 
EN ISO 13849-1:2008; 
f) blanking may only be incorporated into the AOPD as long as the safety distance is such as to ensure that 
it is not possible to reach the danger zone (see A.1). It shall not be possible for the user to increase the 
blanking range. 
The correction of the minimum distance is not required if the following conditions are fulfilled: 
 only one zone is blanked; 
 the detection capability of the light curtain at the blanked zone is equal or less than 30 mm; 
 the detection capability in the rest of the area is equal or less than 14 mm; 
 the safety distance is equal or greater than 150 mm; 
 no possibility to initiate cycles using the light curtain. 
g) Reflective surfaces in the detection plane of the AOPD (e.g. light curtain) can influence the detection 
capability; the recommendation in the technical documentation of the ESPE manufacturer shall be applied. 
Where the light curtain operates by reflecting the transmitted light back along its own path and additional 
reflector(s) are placed within the detection zone, then the configuration of the additional reflector(s) shall 
not allow an item of thickness equal to or greater than the specified test piece size (see 
CLC/TS 61496-2:2006, 4.1.2) to be undetected by the light curtain within the whole of the detection zone, 
unless other measures are taken to ensure that it is not possible to reach the danger zone. 
h) where the AOPD is also used for cycle initiation using either single or double break, the following 
additional conditions shall be fulfilled: 
1) the detection capability shall not exceed 30 mm (see also Annex A); 
2) if, in the front of the press brake, additional guards are needed, they shall either be permanently 
fixed guards (e.g. by welding) or interlocking guards (see EN 1088 and also 5.1.1.4.1 b) and 
5.1.1.4.1 c)); 
EN 12622:2009 (E) 
17 
3) while a part of the body is still in the danger zone (e.g. arms) it shall not be possible to free the 
light curtain for cycle initiation (see also 5.1.1.4.1 d) and Annex A); 
4) before the first cycle initiation and/or in the event of an intervention of another safety system 
preventing access to the tools area, the reset function(s) shall be actuated (e.g. push button, foot 
pedal); 
5) the facility to initiate the press brake motion upon clearing of the curtain shall be limited to the pre-
set time; this pre-set time shall not be capable of exceeding 30 s starting from the end of the previous 
operating cycle. The light curtain shall be required to be manually reset, if the pre-set time has been 
exceeded; 
6) if there is more than one light curtain safeguarding the press brake, only one of them shall be 
selectable for cycle initiation at any one time; 
7) technical measures shall be taken to ensure that the stroke is only initiated after an intrusion into 
the protection field of at least 100 ms and releasing of the protection field; 
8) commonly two possibilities for starting sequences are made available: 
 intrusion and releasing of the protection field, and subsequent actuation of the reset switch; 
 pressing of the reset switch,and subsequent intrusion and releasing of the protection field; 
i) switching off the light curtain by the selector switch shall also switch off its indicator lights. 
5.1.1.4.2 Size and positioning of light curtains 
Light curtains shall be positioned in the following configurations: 
 vertical format, see 5.1.1.4.2 a); 
 horizontal format, see 5.1.1.4.2 b); 
 angled format, see 5.1.1.4.2 c); 
 a combination of formats (see 5.1.1.4.2 d). 
For up stroking press brakes, the position of the bed is measured at its lowest point: 
a) vertical format light curtains shall be configured as shown in Figure 2. The minimum effective vertical 
height of the detection zone of the light curtain shall be 800 mm, where the height of the bed, a, is 
850 mm or more. If the height of the bed is below 850 mm, the detection zone of the light curtain shall 
need to increase in length accordingly. The minimum vertical overlapping distance, b, between the bed 
and the bottom edge of detection zone of the the light curtain shall be at least 50 mm (see Figure 2). 
The minimum height, c, of the top edge of the detection zone of the light curtain shall be 1 600 mm above 
the reference plane. The minimum height c = 1 600 mm or the minimum height of the detection zone 
800 mm of the light curtain may be reduced only if additional safeguarding prevents any access to the 
danger zone. 
The light curtain object detection capability shall be 14 mm or less if no additional distance, C, is used to 
achieve the required safety distance (see Annex A). 
The minimum distance, S, shall be calculated according to the formula given in Annex A, but shall never 
be less than 100 mm. 
Where the vertical format light curtain cannot be placed against the press brake frame, then the resulting 
gap shall be guarded by: 
EN 12622:2009 (E) 
18 
 either fixed or interlocking guards; or 
 additional light beams. 
The gap between bars in a fixed guard, or between the frame and the edge of the fixed or interlocking 
guard or single light beam shall follow the minimum distances set out in EN ISO 13857. 
 
Key 
1 Sheet support 
2 Additional light beam(s)/guard(s)/curtain(s) 
3 Max. distance (see text) reference plan 
 
NOTE Side and rear guards omitted for the purpose of this figure. 
a Height of the bed to operator's stand 
b Overlapping distance 
c Height of top edge of the detection zone of the light curtain 
d Safety distance 
Figure 2 — Configuration of the vertical format light curtain 
 
b) horizontal format light curtains shall be configured as shown in Figure 3 when the height of the bed, a, is 
not less than 800 mm or more than 1 200 mm. The minimum overlapping distance b between the bed and 
the bottom edge of the light curtain shall be 50 mm. 
Where the overall response time is 200 ms or less, the minimum distance, d, shall be at least 1 000 mm. 
Where the overall response time exceeds 200 ms, 20 mm shall be added to the figure of 1 000 mm for 
each additional 10 ms. 
The detection capability shall be 40 mm or less from the bending line to a distance of 550 mm. Beyond 
550 mm, the detection capability shall not exceed 75 mm, but see 5.1.1.4.2 c) where an adjustable 
angled light curtain is used. 
EN 12622:2009 (E) 
19 
Where the horizontal format light curtain cannot be placed against the press brake frame, then the 
resulting gap shall be guarded by 
 either fixed or interlocking guards; or 
 additional light beams. 
The gap between bars in a fixed guard, or between the bed and the edge of the fixed or interlocking 
guard or single light beam shall follow the minimum distances set out in EN ISO 13857. 
 
Key 
1 Sheet support 
2 Max. distance (see text) 
3 Possible alternative position of light curtain 
4 Reference plan 
NOTE Side and rear guards omitted for the purpose of this figure. 
a Height of the bed 
b Overlapping distance 
c Height of the detection zone of the light curtain 
d Safety distance 
Figure 3 — Configuration of the horizontal format light curtain 
 
c) Where an angled format light curtain is used, the light curtain in the vertical and horizontal positions shall 
meet the dimensional criteria laid down in 5.1.1.4.2 a) and 5.1.1.4.2 b) respectively (see Figures 2 and 3). 
If the light curtain can be adjusted to less than 45° from the vertical position, the detection capability shall 
be in accordance with Table A.1. 
d) When a combination of light curtains is used, the formats shall achieve the same level of protection as 
required in 5.1.1.4.2 a) and 5.1.1.4.2 b) above. 
NOTE In relation to muting, see 5.2.5.8. 
EN 12622:2009 (E) 
20 
5.1.1.4.3 Automatically alternating safeguarding methods 
For the use of automatically alternating safeguarding methods with a foot pedal for cycle initiation, the 
following conditions shall apply: 
a) Alternating starting conditions at the chosen top dead centre (TDC) are: 
1) the active light curtain is not interrupted: high closing speed, or 
2) the light curtain is interrupted: only slow closing speed. 
b) Interruption of the active light curtain during the high closing speed or release of the foot pedal shall lead 
to: 
1) Stop; or 
2) reverse to the chosen top dead centre (TDC). 
c) Restart after interruption: starting conditions as at the chosen top dead centre (TDC) (see 5.2.6.2). 
Muting function may be also provided (see 5.2.5.8). 
5.1.1.5 Laser actuated AOPD 
The laser actuated AOPD shall be suitable for the bed length of the machine, the thermal influences, the 
overrun performances and optical reflections expected at the press brake, see also 7.2.2 o). 
These devices are designed specifically for “V” type tools and the manufacturer shall provide instructions on 
which tools can be used. If the tool creates crushing hazards outside the detection zone defined in 5.1.1.5 b) 
(e.g. a non “V” type tool is used), additional safety measures shall be provided to achieve at least the same 
level of protection as defined for “V” type tools in 5.1.1.5 b). 
EXAMPLE move or increase the detection zone, additional detection zones, additional safety systems, earlier slow 
speed to suit crushing hazards. 
The laser actuated AOPD shall comply with the following: 
a) Laser actuated AOPD shall be in accordance with EN 61496-1. 
b) The detection zone provided by this device shall be placed near the upper tool. (e.g. the laser actuated 
AOPD is moving with the beam for downstroking press brake). This protective zone shall comply with the 
following: 
1) A detection zone with a detection capability of 14 mm shall be provided that extend in the vertical 
plane directly under the centre line of the upper tool but not more than 2,5 mm behind (bending line) 
so as to pass the tests in Annex G. 
2) This zone shall also extend forward of the bending plane by at least 15 mm. 
c) Switching off the laser actuated AOPD by the selector switch shall also switch off the indicators lights. 
d) Muting of the entire protective zone described in b.1) and b.2) above or blanking any part of this detection 
zone that affects the test in Annex G during the closing stroke of the press brake shall only be possible if 
the closing speed is already reduced to 10 mm/s or less in conjunction with a three positions hold-to-run 
control device (see 5.1.1.6). In such situation, means shall be provided to ensure that the speed does not 
exceed 10 mm/s, or to stop the stroke if the speed increases. 
EN 12622:2009 (E) 
21 
e) For a special mode of operation, e.g. box bending, the following measures shall be taken to blank only the 
detection zone described in 5.1.1.5, b), 2) with 5.1.1.5, b), 1) still active: 
1) Means of selection shall be provided for this special mode of operation; 
2) A suitable indicator, active when the detection zone is blanked, shall be provided; 
3) Blanking of this detection zone during the closing stroke is possible if the closing speed is reduced 
to 10 mm/s or less, in conjunction with a hold-to-run control device; 
4)This special mode of operation shall be automatically de-activated: 
 at each power on of the machine; 
 after a mode selection change; 
 after a change of program of the numerical control; and 
 within 8 hours running time; 
5) Blanking of this detection zone is also possible when the stroke is required in fast speed (more 
than 10 mm/s), given that the blanking function may be activated before each bending stroke by the 
control system (e.g. by information coming from the numerical control to determine the sequence of 
blanked and non blanked strokes). For each of the strokes requiring the blanking, the operator shall 
have a separate confirming action (e.g. push button or extra depression of foot pedal) before the 
blanking is permitted. 
f) There shall be indicators of the mode of operation of laser actuated AOPD (e.g. box bending mode) 
visible by the operator. 
g) The position setting of laser actuated AOPD shall be lockable against unexpected change, e.g. due to 
vibrations, mechanical shock. 
h) Access to the tool zone shall only be possible from the front side of the press brake. The laser actuated 
AOPD shall prevent in conjunction with other safeguarding access to the danger zone from any other 
direction. 
Any interruption of the detection zone shall result in a stop or inversion of the movement of the beam. The 
hold-to-run control device shall be reactivated to initiate a further closing stroke of the press brake beam. 
If the detection zone remains interrupted it shall only be possible to run the press brake with a closing 
speed equal to or less than 10 mm/s in conjunction with a hold-to-run control device (see 5.1.1.6). 
i) It shall not be possible to initiate travel faster than 10 mm/s while any interruption exists in the detection 
zone appropriate to the selected mode of operation. 
j) The means of resetting shall be so positioned that from that position there is a clear view of the danger 
zone. There shall be only one reset control device for the laser actuated AOPD system. 
k) The press brake stroke shall be controlled by a three positions hold-to-run control device. 
l) An automatic press brake overrun monitoring function shall be provided. 
m) The design of parts other than those protected by the AOPD (e.g. moving tool support dies for crushed 
bends) shall be such that no trapping point is created during the closing and opening movement. If this 
requirement cannot be fulfilled, complementary protection measures shall be taken. 
n) Additional safeguarding shall be provided to prevent any hazard arising due to the laser actuated AOPD 
moving with the beam (e.g. between the laser actuated AOPD and fixed parts of the press brake). 
EN 12622:2009 (E) 
22 
o) The optical design of a laser actuated AOPD shall be in a manner that no optical bypassing can occur on 
reflecting surfaces. 
p) The operator shall be able to detect any person within the dangerous areas of the machine. 
5.1.1.6 Hold to run control 
Provision shall be made to ensure that unintended start-up and inability to stop due to a short circuit in the 
cable connecting the hold-to-run control device to the control system is prevented. 
Where a hold-to-run control device is usable, the press brake shall be operated with slow closing speed 
(≤ 10 mm/s) or in conjunction with an AOPD (see 5.1.1.4). 
One hold to run control shall be active for each operator if more than one operator is working at the machine. 
The hold-to-run control shall be one of the following: 
a) A foot pedal with a single actuator having the following positions: 
 1st position: stop; 
 2nd position: run; 
 3rd position: stop. 
Actuating the pedal to the third position or releasing it to the first position can initiate an opening stroke 
except if the sheet is already being pressed. 
After operating the actuator over a pressure point in 3rd position, a restart shall only be possible after 
returning the actuator to 1st position. Where the hold-to-run device is a foot pedal, the 3rd position shall be 
reached passing a pressure point. The force required shall not exceed 350 N. 
b) A two-hand control which shall comply to EN 574, see Table 2). 
Releasing the two-hand control can initiate an opening stroke except if the sheet is already being pressed. 
5.1.1.7 Scanner systems 
Scanner systems may be used as trip and/or presence sensing device for the press brake danger zones 
under the following conditions: 
a) AOPDDR shall comply with EN 61496-1 and CLC/TS 61496-3; 
 Access to the danger zone shall only be possible through the detection zone of the scanner device 
(AOPDDR). Otherwise additional safeguarding shall prevent access to the danger zone from any 
other point or direction; 
 The detection zone shall always fit with the danger zones, the shadow zones (e.g. behind fixed 
objects) shall be avoided in the danger zones. Where the detection zone is programmable, the 
program and setting of the detection zone shall only be accessible through a password or a tool; 
 The detection capability of the AOPDDR shall be equal or less than 70 mm in any place of the 
danger zones (e.g. it shall not be possible to stand between the detection zone and the press brake 
bed without detection, see Figure 4); 
 The AOPDDR shall not be capable of cycle initiation; 
EN 12622:2009 (E) 
23 
 It shall not be possible to initiate any dangerous movement while anybody or parts of the body e.g. 
legs are detected in the detection zone of the AOPDDR; 
 The minimum safety distances shall be calculated in accordance with EN 999:1998, 6.2; 
b) After any detection, a manual restart function shall be activated, additional reset is not required (since the 
whole danger zone is monitored). 
 
Key 
1 Detection zone 
2 Machinery 
3 Danger zone 
4 Detection plane 
5 Tolerance zone 
a Scanner field not protected 
S Scanner field 
H Height of the scanner field 
Figure 4 — Example of press brake presence sensing using scanner 
The value of "a" shall be small enough to ensure detection at distances up to and including "S" plus the 
tolerance zone. The value of "a" shall be equal or less than 70 mm. 
5.1.1.8 ESPE using AOPD when used in automatic cycle as a trip device 
ESPE using AOPD shall be in accordance with EN 61496-1 and CLC/TS 61496-2. It shall be a system using 
multiple beams (minimum two beams, separate or in form of a light curtain). 
EN 999:1998, Clause 6 shall apply, especially to calculate the minimum distance at which the ESPE using 
AOPD shall be placed from the danger zone. 
The ESPE using AOPD shall not be capable of cycle initiation. 
Access to the danger zone shall only be possible through the detection zone of the ESPE using AOPD, 
otherwise additional safeguarding means shall prevent the access. 
The means of reset shall be in a fixed position outside the danger zone with a clear view of the complete 
danger zone and outside the detection zone and not reachable from the inside of the danger zone. 
EN 12622:2009 (E) 
24 
Blanking may only be incorporated into the ESPE using AOPD as long as the safety distance is such as to 
ensure that it is not possible to reach the danger zone. 
Setting of the blanking range shall only be accessible through a password or a tool. 
The press brake shall be stopped if the blanking function of the ESPE using AOPD is activated while the 
equipment for which the blanking was necessary has been removed. 
5.1.2 Location of the safeguarding of access to moving parts 
5.1.2.1 Prevention of access from the front 
5.1.2.1.1 General 
Where a press brake is capable of being manually loaded and/or unloaded the safeguarding system of the 
tools area shall not rely solely on the use of fixed enclosing guard(s). It shall always be supplied with one or 
more of the safeguarding systems listed in 5.1.1.3 to 5.1.1.6. Additionally, when it is necessary to prevent a 
person from standing in the front area of a press brake, a presence sensing protective device shallbe used. 
The device may be an AOPDDR scanner described in 5.1.1.7 or a horizontal light curtain. 
Where a press brake which allows manual loading and/or unloading is supplied with one or more of the 
safeguarding systems listed in 5.1.1.3 to 5.1.1.7 it shall not be possible to operate the press brake at speeds 
in excess of 10 mm/s with the safeguarding system disconnected. 
Press brakes intended to work solely in automatic cycle with automatic loading and unloading shall always be 
supplied with one or more of the safeguarding systems listed in 5.1.1.3 or 5.1.1.8. When it is necessary to 
prevent a person to enter and/or to stand in the front area of a press brake (e.g. to check if nobody is too close 
to the press brake dangerous zone when starting the automatic cycle), a presence sensing protective device 
shall be used. The device may be an AOPDDR scanner described in 5.1.1.7 or a horizontal light curtain. If no 
access is required for production and setting mode for automatic cycle, the safeguarding system of the tools 
relying solely on the use of fixed enclosing guards (see 5.1.1.2) is possible. 
5.1.2.1.2 Protection against injury caused by the deflection of a protruding workpiece 
Means shall be provided to minimise the risk to exposed persons caused by the movement of sheet metal 
during the bending process. In this regard, the protective device (see 5.1.1) shall be active during the 
hazardous closing movements (see 7.2.2 i)). The following measures shall also be taken where reasonably 
practicable taking into account the intended use: 
a) a facility to reduce the bending speed; 
b) a facility to reduce the return speed until the moving part of the tools loses its contact with the work-piece; 
c) a facility for non-automatic return of the moving part of the tools, to avoid injury from falling work-pieces 
during opening of the tools; 
d) the provision of powered work-piece supports and/or handling devices, e.g. mechanically linked or 
numerically controlled supports. 
An equivalent level of protection shall be provided for each operator (see 5.1.1.). If the press brake is 
designed to be used at slow (equal or less 10 mm/s) closing speed only and with the possibility of more than 
one operator, then the press brake shall be provided: 
e) either with one hold-to-run control device for each operator; 
f) or with a device ensuring an equivalent level of protection for each operator. 
EN 12622:2009 (E) 
25 
5.1.2.1.3 Protection against injuries caused by back gauges movement 
The operator shall be protected against hazardous movements of automatically operated back gauges, e.g. 
those towards the operator, sidewards and upwards. The following measures, either singly or in combination, 
shall be taken: 
a) movement initiation by the operator (i.e. no automatic back gauge initiation); 
b) the facility to allow the demarcation of a zone in which only reduced speed (less than or equal to 2 m/min) 
or limited force (less than or equal to 150 N) movement is possible. This demarcation zone shall be 
arranged so that the reduced speed occurs for at least the last 50 mm of motion to any trapping point (e.g. 
between the back gauges and the correctly positioned work-piece, the back gauge and the tools). 
NOTE These two measures may involve the use of a PES. 
5.1.2.2 Prevention of access from the sides 
Press brakes capable of being manually loaded and/or unloaded shall be provided with guards which prevent 
lateral reach from the sides of the press brake (see Annex E for an example) into the danger zones. Any such 
guard shall be interlocked so that the closing stroke cannot be initiated when the guard is opened, and the 
closing stroke is stopped if the guard is moved during the stroke. These guards shall be interlocked with the 
machine control system in accordance with EN 1088:1995, 6.2.1. 
It shall not be possible to stand between the press brake and the closed side guard. Opening such interlocking 
guard shall stop hazardous movements (e.g. beam, back gauges, supports, and integral handling devices). If 
operating the machine is required with one of the interlocked side guards open, a hold-to-run control device 
used in conjunction with a slow closing speed (equal to or less than 10 mm/s) shall be provided for this 
operation and the movement of the back gauges shall only be possible at reduced speed (less than or equal 
to 2 m/min). 
Press brakes intended to work solely in automatic cycle with automatic loading and unloading shall always be 
supplied with one or more of the safeguarding systems listed in 5.1.1.2, 5.1.1.3 or 5.1.1.8. When it is 
necessary to prevent a person from entering and/or standing in the side area of a press brake (e.g. to check if 
somebody is too close to the press brake dangerous zone when starting the automatic cycle), AOPDDR as 
described in 5.1.1.7 may be used as trip and/or presence sensing device. Where access is required for 
production and setting mode for automatic cycle, the safeguarding system of the tools shall not rely solely on 
the use of fixed enclosing guards (see 5.1.1.2). 
5.1.2.3 Prevention of access from the rear 
The access to the tools, back gauges and ancillary devices area shall be prevented. This shall be done using 
one or more of the following means: 
a) Interlocking guards or interlocking guards in conjunction with fixed guards (see 5.1.1.2 and 5.1.1.3). 
b) ESPE using AOPD with separate beams disposed in a vertical plane. This shall be a system using at 
least two separate light beams (see EN 999:1998, 6.1.4 for the positioning of the beams). The required 
safety distance to the nearest trapping point shall be at least 1 000 mm when three beams are used; at 
least 1 200 mm when two beams are used. It shall be in accordance with EN 61496-1 and 
CLC/TC 61496-2 (and see Table 2 for the type). A reset at the rear of the press brake shall be provided. 
c) AOPDDR as described in 5.1.1.7. Press brakes intended to work solely in automatic cycle with automatic 
loading and unloading shall always be supplied with one or more of the safeguarding systems listed in 
5.1.1.3 or 5.1.1.8. When it is necessary to prevent a person from entering and/or from standing in the rear 
area of a press brake (e.g. to check if somebody is too close to the press brake dangerous zone when 
starting the automatic cycle), AOPDDR as described in 5.1.1.7 may be used as trip and/or presence 
sensing device. Where access is required for production and setting mode for automatic cycle, the 
safeguarding system of the tools shall not rely solely on the use of fixed enclosing guards (see 5.1.1.2). 
EN 12622:2009 (E) 
26 
5.2 Control systems 
5.2.1 General 
This subclause shall apply to all safety-related components which directly or indirectly control or monitor the 
functioning of moving parts of the press brake or its tools (see Table 2). EN 60204-1 shall be followed for the 
design of electrical systems and EN 954-1 or EN ISO 13849-1 for the safety-related parts of electrical, 
hydraulic, pneumatic and mechanical systems. 
NOTE 1 In addition to the requirements in 5.2.5, see EN ISO 12100-2:2003, 4.11.1 and 4.13. 
The redundant and monitored press brake control system shall operate in two separate functioning systems. 
Either system shall be independently capable of stopping the hazardous movement irrespective of the 
condition of the other. Failure of either system shall be detected through monitoring and another closing stroke 
prevented. Failure of either system shall be detected through monitoring and another closing stroke prevented. 
The control system of each cylinder capable of independent movement shall be provided with redundancy and 
monitored functions (see Figure C.1). 
NOTE 2 Mechanically linked cylinders, e.g. by a torsion bar, are considered as a single cylinder. 
5.2.2 Manual control devices 
Control devices shall be located and marked according to EN 894-1, EN 894-2, EN 894-3 and conform to 
EN 60204-1:2006, Clause10. 
Push button, foot pedal and other types of manual start control devices shall be shrouded to prevent 
accidental operation or/and unintentional activation. Foot pedals shall permit access from one direction only 
and by one foot only. Treadles shall not be used. 
NOTE See also 5.1.1.6 and 5.2.5.11. 
5.2.3 Failure of power supply 
Interruption or a failure of the power supply shall not result in a loss of safety function until a complete stop is 
reached. Restoration of the energy supply shall not result in a press brake automatic restarting (see 
EN ISO 12100-1:2003, 3.29). Systems shall be designed so that a line rupture in any circuit (e.g. broken wire, 
pipe or hose) will not result in the loss of a safety function (see EN 60204-1, EN 982 and EN 983). 
5.2.4 Protection against external influences 
Press brake electrical/electronic control system shall be protected against external influences (e.g. vibration, 
dust, water, electromagnetic fields) and be capable to pass the tests according to EN 50370-1 and 
EN 50370-2 for the given performance criterion defined by the manufacturer. 
5.2.5 Safety functions 
5.2.5.1 General 
All the safety functions identified and described in this subclause shall meet the requirements of EN 954-1 or 
EN ISO 13849-1 and EN 61496-1 or EN 574 stated in the Tables 2 and 3. 
NOTE When EN ISO 13849-1 is chosen, the performance levels of Tables 2 and 3 apply; when EN 954-1 is 
chosen, only the categories apply. 
Safety related parts (e.g. PLC) in accordance with EN ISO13849-1 or EN 62061 may be used as parts of the 
control system, which shall fulfil the requirements of Tables 2 and 3. 
EN 12622:2009 (E) 
27 
Figure 5 gives an example of safety related control system of a pressbrake designed in accordance with 
Table 2. 
 
Beam 
cylinder(s) 
 
Hydraulic 
control 
system 
Back 
gauges 
 
Electronic 
Power 
Drive Monitoring
Monitoring
 Control 
Control 
Electric/Elect
ronic Safety 
Related 
Control 
System 
 
Eg. Relays, 
Safety 
modules, 
PES, … 
Selection 
means 
Rear 
interlocking 
guard 
Side 
interlocking 
guards 
Hold to run 
control device 
Front AOPD 
M 
Input 
Sensor area 
Logic
(Control) 
Output
Pre-actuators 
actuators 
Keyboard 
 
Numerical 
Control 
Other 
safeguarding 
devices 
Other sensors 
 
Figure 5 — Example of safety related control system of a pressbrake designed in accordance with 
Table 2. 
EN 12622:2009 (E) 
28 
Table 2 — Safety and reliability of control systems for single cycle manual load and/or unload or setting mode 
NOTE If no interface is implemented between input and output, requirement of logic does not apply. 
Safety function 
PLr 
Required Performance 
level (PLr) 
Basis for PLr of input, Logic, output 
Input 
(sensor area) Logic 
control a structure of 
Category 
Output 
(pre-actuator) a 
Description Classification (category, type) Description Category b 
Stop or hold to 
stop closing 
stroke of the 
beam k 
Front side (see 5.1.2.1) 
PLe ESPE using AOPD (see 5.1.1. 4) Type 4
 
4 
Hydraulic system (e.g. 
directional control valves, 
restraint valves, etc.) 
Category 4l 
PLe 
Laser actuated with 
AOPD in conjunction 
with checking of 
stopping distance (see 
5.1.1.5) 
Type 4 
PLd 
AOPPDR (when used 
additionally – see 
5.1.1.7.1) 
Type 3 3 Category 3 
PLd 
Hold-to-run control j (see 
5.1.1.6) (when used in 
conjunction with slow 
speed):1st and 3rd 
position of the single 
actuator 
Two separate contacts 
each one category B 3 
c Category 3 c 
PLc m 
Hold-to-run control 
(when used in 
conjunction with slow 
speed all over the 
stroke): 1st and 3rd 
position of the single 
actuator 
Two separate contacts 
each one category B 3 
c Category 1m 
PLc 
Complementary 
interlocking guards (see 
5.1.1.4.2 a) 
Category 1 d 
2 c 
(check periodicity: each 
power on) 
Category 3 c 
 
 
 
EN 12622:2009 (E) 
29 
 
Table 2 (continued) 
Safety function 
PLr 
Required Performance 
level (PLr) 
Basis for PLr of input, logic, output 
Input 
(sensor area) Logic control a structure of 
Category 
Output 
(pre-actuator) a 
Description Classification (category, type) Description Category b 
Stop or hold to 
stop closing 
stroke of the 
beam k 
Sides (see 5.1.2.2) PLc Interlocking device (see 5.1.1.3) Category 1
 d 
Category 2 
(check periodicity: each 
power on) or category 3 
Hydraulic system (e.g. 
directional control valves, 
restraint valves, etc.) 
Category 3 c 
Rear (non operator's 
position) 
(see 5.1.2.3) 
PLc Interlocking device (see 5.1.1.3) Category 1
 d 
Category 2 
(check periodicity: each 
power on) ) or category 3 
Category 3 c 
PLd 
ESPE using AOPD 
using separate light 
beams (see 5.1.1.4) 
Type 4 
(1 transmitter/receiver) Category 4 
Category 3 c PLd 
Type 2 
(2 transmitters/2 
receivers) 
A separate category 2 
interface for each 
transmitter/receiver 
(check periodicity: 
automatically every 5 s) 
PLd AOPDDR Type 3 Category 3 
Emergency stop 
function (see 5.2.5.10) PLd 
Emergency stop push 
button Category 1
 e 
Category 2 
(check periodicity: each 
power on) 
Category 3 c 
EN 12622:2009 (E) 
30 
Table 2 (continued) 
Safety function 
PLr 
Required Performance 
level (PLr) 
Basis for PLr of input, logic, output 
Input 
(sensor area) Logic control a 
Structure of Category 
Output 
(pre-actuator) a 
Description Classification (category, type) Description Category b 
Stop back 
gauges k 
Sides (non operator's 
position) 
(see 5.1.2.2) 
PLc Interlocking device (see 5.1.1.3) Category 1
 d 
Category 2 (check 
periodicity: each power 
on) 
Electrical (e.g. power 
contactors, electronic power 
drive of the motor, etc.) or 
pneumatic (e.g. valves) 
system 
Category 2 (check 
periodicity: each power on) 
Rear (non operator's 
position) 
(see 5.1.2.3) 
PLc Interlocking device (see 5.1.1.3) Category 1
 d 
Category 2 (check 
periodicity: each power 
on) 
PLc ESPE using AOPD using 
separate light beams 
(see 5.1.1.4) 
Type 4 
(1 transmitter/receiver) Category 2 (check 
periodicity: each power 
on) PLc Type 2 (2 transmitters/ 2 receivers) 
PLc AOPDDR Type 3 
Category 2 (check 
periodicity: each power 
on) 
Emergency stop function 
(See 5.2.5.10) PLd 
Emergency stop push 
button Category 1
 e 
Category 2 (check 
periodicity: each power 
on) 
Back gauges 
movement 
limitation 
Front side (see 
5.1.2.1.3) 
PLa Movement initiation device (by the operator) Category B 
 
Category B - PES may 
be used 
Electrical (e.g. power 
contactors, electronic power 
drive of the motor, etc.) or 
pneumatic (e.g. valves) 
system 
 
 
Category B - PES may be 
used PLa 
Sensor (demarcation of 
the zone with reduced 
speed or limited force 
Category B 
 
Category B - PES may 
be used 
Stop work-piece 
support 
movement k 
(see 5.2.5.6) 
Emergency stop function 
(see 5.2.5.10) 
PLd 
Emergency stop push 
button Category 1
 e 
Category 2 (check 
periodicity: each power 
on) 
Electrical system Category 2 (check periodicity: each power on) 
PLd Pneumatic or hydraulic system Category 2 (check periodicity: each power on 
Initiation device or other safeguarding measures 
EN 12622:2009 (E) 
31 
Table 2 (continued) 
Safety function 
PLr 
Required 
Performance 
level (PLr) 
Basis for PLr of input, logic, output 
Input 
(sensor area) 
Logic control a 
Structure of Category 
Output 
(pre-actuator) a 
Description 
Classification 
(category, 
type) 
Category Description Category b 
Slow speed (≤ 10 mm/s) in case of hold-to-
run control (entire closing stroke) (see 
5.2.5.7) 
PLc Selector switch (see 5.2.5.11) Category 1 Category 4f Hydraulic system (valves) Category 1g 
Slow speed with hold-to-run control 
(machines designed to work only with speed 
≤ 10 mm/s - entire closing stroke) 
PLc No input - No logic Hydraulic system (valves) Category 1g 
Muting of AOPD 
PLe 2 sensors Each one Category Bh Category 4 Logic part shall act on the OSSD of the AOPD to be muted. 
PLe Speedmeasurement devicei Category 4 Category 4 Logic part shall act on the OSSD of the AOPD to be muted. 
Slow speed (≤ 10 mm/s) in case of hold-to-
run control and when an AOPD is muted (see 
5.2.5.7 and 5.2.5.8) 
PLa 
Position sensor of the beam 
(e.g. electronic way 
measurement system, position 
switch, etc.) 
Category B category B Hydraulic system (valves) Category 1g 
Blanking (for AOPD) PLe Blanking shall be of the same category as the AOPD. 
Blanking (for laser actuated AOPD) PLe Blanking shall be of the same category as the laser actuated AOPD. 
Checking of stopping distance "overrun 
monitoring (see 5.1.1.5 l)" in case of laser 
actuated with AOPD 
PLc Position sensor Category B 
Category 2 (including the 
monitoring of the input) 
Check periodicity: at least at 
each power on and at 
subsequent 30 h running 
time) 
Logic control shall act on the 
appropriate part of the 
electrical control system 
Category 2 
Selection of mode of safeguarding, and 
indication of number of operators (see 
5.2.5.11) 
PLc Selector switch Category 1 e Category 4 
Logic control shall act on the appropriate part of the electrical control 
system PLc Selector switch Category B Category 4 (including the monitoring of the input) 
EN 12622:2009 (E) 
32 
Table 2 (end) 
Safety function 
PLr 
Required 
Performance 
level (PLr) 
Basis for PLr of input, logic, output 
Input 
(sensor area) Logic control a 
Structure of Category 
Output 
(pre-actuator) a 
Description Classification (category, type) Description Category b 
Reset of protective device or guards (see 
5.2.6.2) PLb Control device Category B 
Category 2 (check 
periodicity: each power on 
and after each actuation) 
Logic control shall act on the appropriate part of the electrical control 
system 
Single stroke (see 5.2.5.12) PLb 
Information from control 
system, signalling release of 
the control device at top dead 
centre. 
Category B 
Category 2 including the 
monitoring of the input 
(check periodicity: each 
cycle) 
Logic control shall act on the appropriate part of the electrical control 
system 
a For a given safety function, if the table requires various categories of the output or logic part, the following applies: 
 Category 4 may be used instead of category 2 or 3; 
 Category 3 may be used instead of category 2. 
b The category may be achieved in conjunction with logic control, if appropriate, e.g. the redundancy may be achieved by the hydraulic system and the monitoring function by the logic control. 
c Use of category 4 where it exists for this safety function either in another mode of operation or for another single cycle using a different input. 
d See EN 1088:1995,.2.1. 
e Input using a contact of the “direct operating action” type (according to EN 60947-5-1:2004, Annex K). 
f The logic part may be electric, hydraulic (e.g. valves to control the slow speed) or a combination of both (e.g. electric control system combined with position monitored valves). 
g See 5.2.5.6. 
h A logic part shall be implemented to achieve category 4 from the sensors to the OSSD of the AOPD. The sensors give information that the slow speed less or equal to 10 mm/s is operative (for instance, 
monitoring sensors of the speed limiting device). 
i For example, speed measurement device which is integrated part of a laser actuated AOPD. 
j If the hold-to run control is a Two-Hand Control, then it shall comply with type 2 of EN 574:1996. 
k Stop category 0 or 1 according to EN 60204-1:2006. 
l When a PLC is used, valve monitoring shall be performed by a PLC dedicated for safety functions of category 4 or equivalent. 
m For machines designed to work only with slow speed less than or equal to 10 mm/s – entire stroke – use of category 1 is permitted. 
 
EN 12622:2009 (E) 
33 
 
Table 3 — Safety and reliability of control system for automatic cycle with automatic load and unload 
only 
NOTE If no interface is implemented between input and output, requirement of logic does not apply. 
Safety function 
PLr 
Required 
Performan
ce level 
(PLr) 
Basis for PLr of input, logic, output 
Input 
(sensor area) 
Logic control a 
Structure of 
Category 
Output 
(pre-actuator) a 
Description Classification (category, type) Description Category 
b 
Stop 
closing 
stroke of 
the beam, 
stop of 
ancillary 
device 
(loading 
device, 
back 
gauges, 
etc.) 
Relevant 
side 
PLc 
Interlocking device 
with guard locking 
(see 5.1.1.3) 
Category 1 d 
Category 2 (check 
periodicity: each 
power on) 
Hydraulic 
system (e.g. 
directional 
control valves, 
restraint 
valves, etc.) or 
electrical 
system (for the 
automatic 
loading and 
unloading 
system) 
Category 2 c 
(check 
periodicity: each 
power on) 
PLc 
Interlocking device 
without guard 
locking (see 
5.1.1.3) 
2 separate switches 
each one category B Category 3 Category 3 
PLd AOPDDR Type 3 Category 3 c 
Category 3 a 
PLd ESPE using AOPD (see 5.1.1.8 ) Type 4 Category 4 
c 
Emergen
cy stop 
function 
(See 
5.2.5.10) 
PLc Emergency stop push button Category 1
 e 
Category 2 (check 
periodicity: each 
power on) 
Category 2 c 
(check 
periodicity: each 
power on) 
Selection of mode of 
safeguarding (see 
5.2.5.11) 
PLc 
Selector switch Category 1 e Category 4 
Logic control shall act on the 
appropriate part of the electrical 
control system 
Selector switch Category B 
Category 4 (including 
the monitoring of the 
input) 
Reset of protective 
device or guards PLb Control device Category B 
Category 2 (check 
periodicity: each 
power on and after 
each actuation) 
Logic control shall act on the 
appropriate part of the electrical 
control system 
a For a given safety function, if the table requires various categories of the output the following applies: category 4 may be used instead of 
category 2 or 3 and category 3 may be used instead of category 2. 
b The category may be achieved in conjunction with logic control, if appropriate, e.g. the redundancy may be achieved by the hydraulic 
system and the monitoring function by the logic control. 
c Use of category 4 where it exists for this safety function either in another mode of operation or for another single cycle using a different 
input. 
d See EN 1088:1995, 6.2.1. 
e Input using a contact of the “direct opening action” type (according to EN 60947-5-1:2004, Annex K). 
 
5.2.5.2 Behaviour of the control system in case of failure 
Except press brakes solely used for automatic load or unload working in automatic cycle and fitted with an 
interlocking guard with guard locking and press brakes solely designed for hold to run control devices used in 
conjunction with slow closing speed, the following requirements apply except for powered work-piece supports 
and programmable back gauges. 
EN 12622:2009 (E) 
34 
If a fault occurs in the safety-related parts of these protective devices or control system then: 
a) an unexpected start up shall not be possible; 
b) the safe functioning of the protective device shall be maintained after the first fault; 
c) it shall still be possible to stop the press brake during the dangerous movement; 
d) the control system shall stop the press brake during the dangerous phase of the closing stroke within the 
response time specified by the manufacturer or, in other cases1) at the next demand upon the safety 
function or at the latest at the end of the operating cycle; 
e) the control system shall prevent any initiation of the next operating production cycle until the fault is 
eliminated. 
In order to meet these requirements, the safety-related parts of the control systems shall meet the category of 
EN 954-1 or the performance levels of EN ISO 13849-1:2008, given in Table 2. 
5.2.5.3 Stop or hold to stop closing stroke of the beam 
When the stopping signal is given during a high speed closing movement, the stroke shall stop or reverse the 
movement of the stroke. When the stopping signal is given during bending, the closing stroke shall stop (seealso 5.1.1.6). 
This safety function shall ensure that the beam of the press brake is stopped in the shortest time when the 
machine is running and: 
 one safeguarding system is actuated due to an intrusion from the front, side or rear of the machine during 
the closing cycle; or 
 the emergency stop button is actuated; or 
 when the mean of selection is actuated; or 
 the hold to run control is release or forced to the third position. 
Once the beam is stopped, the pre-actuators shall maintain it stopped (see 5.3.1.1) until a signal for starting is 
given and the safety conditions are restored. 
5.2.5.4 Stop back gauges 
See Tables 2 and 3. 
Activation of the stop function (see also 5.2.5.10 for the category of stop), of a powered back gauge, which 
may be controlled by the NC, is only required when the operator can fully enter the area of the press brake 
where the movement of the back gauge can cause injury (access from the sides or rear of the press brake). 
5.2.5.5 Back gauges movement limitation 
If the machine is equipped with powered back gauges, to avoid or limited the action of trapping of the back 
gauges in its movements from the previous position to the next one, in the proximity of the operator working 
position, the so-called movement limitation function shall be implemented. The movement limitation function 
can be implemented in two different ways (see 5.1.2.1.3). 
 
1) Examples of this are: 
 Where a fault occurs in one channel of a two channel control system, so that the other channel remains 
operative; 
 Where a fault occurs during parts of the cycle other than the dangerous phase of the closing stroke. 
EN 12622:2009 (E) 
35 
5.2.5.6 Stop work-piece support movement 
When powered work piece supports are used on a press brake manually loaded or unloaded, the following 
measures shall be provided to prevent any hazard caused by the work piece support: 
a) a means of selection (see 5.2.5.11) shall be provided to enable the powered work piece support 
movements; 
b) if independent powered work piece supports are present in a press brake, then a means of selection shall 
be provided for each powered work piece support to enable its movement (see 5.2.5.11); 
c) the upward movements of the powered work piece support shall be possible only by a hold-to-run control 
system (e.g. three positions foot pedal); an unexpected start-up shall be prevented; 
d) a facility to use a hold-to-run control device (e.g. three positions foot pedal) shall be provided to control 
the downward movement of the powered work piece support, an unexpected start-up shall be prevented. 
The speed of downward movement shall be calculated and set accordingly in order to prevent dangerous 
mechanical shocks from the workpiece and the powered workpiece support towards the operator; 
e) a restraint device (e.g. check valve, mechanical brake) to prevent unintended gravity fall of the powered 
work piece support shall be provided. The restraint device shall operate automatically and shall be 
effective whenever the powered work piece support is stopped; 
f) measures shall be taken to prevent the crushing hazard between the fix and the moving part of the 
powered work piece support; 
g) when the powered work piece supports are equipped with vertical automatic movement, start-up shall be 
done by the operator (no one automatic start up ordered by the NC alone shall be possible), to protect 
exposed persons from the dangerous movements that can be generated (crushing and/or fall of the 
working piece hazard); 
h) when the powered work piece supports are equipped with horizontal automatic movement, the operator 
shall control the movement by a hold-to-run control (no one automatic start up ordered by the NC alone 
shall be possible). 
5.2.5.7 Slow speed 
The maximum slow speed shall be 10 mm/s. 
The maximum slow speed shall not solely be limited by adjustment of variable parameters. Means of limitation 
are e.g. fix orifice plate, limited pump capacity, non-adjustable hydraulic throttle-valve, fixed bleed and max 
supply of hydraulic energy. 
If the maximum slow speed is exceeded, a stop shall be initiated (see 5.2.5.12). 
The valve(s) for speed limiting shall be monitored or a speed measuring system shall be incorporated. 
5.2.5.8 Muting 
Muting of the safeguarding shall be possible only when no hazard from the closing stroke exists. 
To ensure that muting is only possible in slow speed (see 5.2.5.7) on manually loaded machines, the 
performance levels given in Table 2 shall be fulfilled. 
The activation of a speed change before the muting occurs may be realised for example by a PES. 
The muting shall only be initiated and active, if: 
 the slow speed (see 5.2.5.7) is reached and in conjunction with a hold-to-run control device; or 
 during the opening stroke, when no additional hazard between parts of the machine exists. 
EN 12622:2009 (E) 
36 
If the protection field is interrupted before the slow closing speed is reached, the closing stroke shall be 
stopped. The continuation of the closing stroke shall only be possible with slow speed (see 5.2.5.7). 
If the protection field remains interrupted, the continuation of the closing stroke shall only be possible with 
slow speed equal or less than 10 mm/s in conjunction with a hold to run control device. 
5.2.5.9 Blanking 
Blanking (see 3.1.2) of some area(s) of the sensing part of an AOPD shall be accompanied with 
complementary or compensatory measures as an increase of the safety distance (for AOPD in the form of 
light curtain) or a change to slow safety speed of the beam of the press brake, with the exceptions described 
in 5.1.1.4.1 f) for light curtains and for laser actuated AOPD in 5.1.1.5 e). 
The means to activate this optional safety function shall be incorporated into the AOPD by the manufacturer of 
the device and the safety performance and/or the resistance of defaults is given in Table 2. 
For the setting of the blanking range, see 5.1.1.4.1 and 5.1.1.5 e). 
The press brake shall be stopped if the blanking function of the ESPE using AOPD is activated while the 
equipment for which the blanking was necessary has been removed. 
5.2.5.10 Emergency stop 
Emergency stop function shall conform with category 0 (or category 1 if electronic motor control systems are 
used), according to EN 60204-1:2006, 9.2.2 and be in conformity with the requirements of EN 60204-1:2006, 
9.2.5.4.2 and with EN ISO 13850. If the energy to the valves is cut off, the hydraulic pump may still be running 
if energy is required for movements of hydraulic powered safety-related parts. 
For mechanisms requiring a sequenced shut down (e.g. for back gauges), emergency stop function shall be of 
stop category 1 according to EN 60204-1:2006, 9.2.2. 
Emergency stop function shall be initiated by emergency stop device(s) which shall conform to EN 60947-5-3 
and shall be provided at each operator's position and at least: 
 at the main control panel; 
 at the portable control panel (if provided); 
 at the loading and unloading stations (if separate from the main operator's position). 
There shall be at least one emergency stop device according to EN 60204-1 within direct reach of each 
operator. Any disconnectable control station shall not incorporate an emergency stop button if the press brake 
can be operated while this control station is disconnected. 
5.2.5.11 Mode selection 
Means (e.g. selector switch) to select combination of safeguarding, number of operators and/or mode of 
operations shall be provided. This shall ensure that only the selected combination or mode is active at any 
time. 
If the mode selection is operated during a dangerous movement (e.g. closing stroke), this movement shall be 
stopped. If the selection means is set in an intermediate position, no dangerous movement shall be possible. 
The control system shall ensure that no start-up is initiatedwhen the mode selection is operated. 
There shall be provisions (e.g. key or password) to ensure that non-authorised persons cannot change the 
selected position at least for the following: 
 from a production mode to setting mode (if the level of safety is different); 
 for the selection of safeguarding; 
EN 12622:2009 (E) 
37 
 the number of operators; 
 powered workpiece support selection. 
NOTE The password could be programmed through a numerical control (NC). 
The selection means shall be designed in such a way that protection systems intended for a certain mode of 
operation is always active when that mode is selected. 
If there is more than one operator at the press brake, the level of protection shall be the same for each 
operator. For each combination selected, the number of active hold-to-run control devices shall be the same 
as the number of operators and the active hold-to-run control device shall be indicated. 
When one operator can use different hold-to-run control devices at successive operator’s position, only one 
hold-to-run control device shall be active at that time and the active hold-to-run control device shall be 
indicated. 
Selector switches for safety-related functions shall be key operated, according to EN 60204-1:2006, 9.2.3. 
The selection shall be visible and clearly identifiable. If the key is removed, the selector switch shall be locked. 
5.2.5.12 Single stroke function 
Where a press brake is designed to be used in single cycle mode, a single stroke function shall be provided. 
This function shall prevent a subsequent stroke even if the control device is continuously actuated. A further 
stroke shall require the release of the control device and a new initiation. 
5.2.6 Other functions 
5.2.6.1 Start 
Start of an operation shall be possible only when all safeguards (interlocking guards, light curtains, etc.) are in 
place and functional (see EN 60204-1:2006, 9.2.5.2). For this purpose, interlocking arrangements required in 
5.2.5.11 and 5.3.2.2 shall be fulfilled. 
It shall only be possible to start the operating mode of the press brake which has been selected (see 5.2.5.11). 
In order to avoid unintended start-up, portable pedestals or pendants incorporating start buttons shall be 
designed, with regard to stability, support and impact forces. 
Unexpected start up of hazardous movements, e.g. beam, back gauges, work-piece support, shall be 
prevented. This also includes the requirements of EN 1037, see 5.3.2.1.2 of this European Standard. 
The machine shall only be started by actuation of the start device provided for that purpose. 
If more than one start control device is in use then all start control devices shall be actuated simultaneously. 
5.2.6.2 Restart 
Automatic or unexpected restart of the machine shall be prevented: 
a) after changing the mode of cycle initiation, production or operator safety system; 
b) after actuation of a safeguarding system requiring a stop (e.g. AOPD, interlocking guards); 
c) after a manual reset of the safety system (see 5.2.6.3); 
d) after an operating power failure. 
EN 12622:2009 (E) 
38 
5.2.6.3 Reset 
When a person can pass through the safeguarding system (guards or AOPD) and remain undetected in the 
hazard zone, a manual reset shall be required. 
When an AOPD is used at the front side and is used for cycle initiation, see 5.1.1.4.1 h). 
When using AOPDDR as described in 5.1.1.7.1 b), a reset shall not be required. 
Reset controls shall be within viewing distance, but out of reach, of the dangerous area. 
5.2.6.4 Normal stop 
Means (e.g a push button) shall be provided to bring the machine to a complete stop. All the actuators for the 
moving parts shall be de-energized. 
5.2.7 Use of electronic components 
5.2.7.1 Access to the NC program 
For the implementation of any safety-related function with electrical and/or electronic equipment (including 
software) the appropriate requirements of EN 954-1 or EN ISO 13849−1, EN 62061 and EN ISO 13849-2 
shall apply. 
5.2.7.2 Use of PES for safety functions 
5.2.7.2.1 General 
For the implementation of any safety-related function with electrical and/or electronic equipment (including 
software) the appropriate requirements of EN 954-1 or EN ISO 13849-1, EN 62061 and EN ISO 13849-2 shall 
apply. 
The safety functions listed in Tables 2 and 3 can be performed by a programmable electronic system (PES). 
5.2.7.2.2 PES requirements 
PES shall be designed according to the applicable requirements of EN 954-1 or EN ISO 13849-1 or 
EN 62061. 
PES (e.g. equipment based upon programmable electronic technology such as a programmable logic 
controller (PLC)) shall be designed for use in a safety-related application. 
In particular PES shall pass the electromagnetic compatibility tests according to EN 62061. 
The use of PES (programmable electronic systems) shall not reduce the performance of safety functions 
specified in this European Standard. 
5.2.7.2.3 PES hardware aspects 
PES hardware (including sensors, actuators, PLCs, logic solvers, etc.) shall be selected (and/or designed) 
and installed according to the manufacturer's instruction (technical manual). 
The combination of the parts shall meet the safety performance requirements of Tables 2 and 3. 
5.2.7.2.4 PES software aspects 
PES application software shall conform to EN 62061:2005, 6.10 and 6.11. 
EN 12622:2009 (E) 
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Application software that controls the press brake shall not be re-programmable by the user. 
As characteristics of PES control program affect overall system response time, they shall be included in 
calculation of worst case consideration. 
5.3 Mode of operation 
5.3.1 Description of the various modes of operation 
All press brakes shall have a setting mode of operation and one or both of the following production modes: 
 single cycle, manual load or unloading; 
 automatic cycle with automatic load and unload. 
5.3.2 Setting mode 
Setting mode includes tool setting, trial strokes, maintenance, lubrication and manual adjustment. 
The machine shall be designed so that tool setting, maintenance and lubrication can be carried out safely. The 
need for access and manual intervention during setting and maintenance shall be minimised, e.g. an 
automatic system or remote application may be used for lubrication. 
Facilities shall be provided to allow the movement of the beam during tool setting, maintenance and 
lubrication to be carried out with guards and protective devices in position and operational (see 5.1.1.1.). 
Where this is not practicable, hold-to-run control device used in conjunction with slow speed (equal or less 
than 10 mm/s) (see 5. 1.1.6) shall be provided. 
Single stroke function shall be active when setting mode is selected (see 5.2.5.12). 
All trial strokes (single operating cycle) after tool setting or adjustment are considered in this European 
Standard as production strokes, and the safeguarding shall meet the requirements specified in 5.1.1. 
If, taking into account the intended use, it is foreseeable that there will be more than one person on a side, 
additional devices (e.g. enabling devices, control devices for tool setter) shall be provided. 
The means of manual adjustment, e.g. to the stroke or beam adjustment, or speed change, the alteration of 
which can cause a hazard, shall have a reliable locking device which only allows adjustment by means such 
as a tool or a key. 
5.3.3 Production modes 
5.3.3.1 Single cycle manual load and/or unload 
5.3.3.1.1 Cycle initiation 
Each cycle shall be initiated by a device intended for that purpose, e.g.: 
 foot pedal; 
 ESPE using AOPD in the form of light curtain (see 5.1.1.4.1 h). 
5.3.3.1.2 Control system 
In addition access to hazardous movement of automatically operated back gauges movement e.g. those 
towards the operator, side wards and upwards, of back-gauges, shall be prevented (see 5.1.2.1.3). 
EN 12622:2009 (E) 
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5.3.3.2 Automatic cyclewith automatic load and unload 
The first cycle (i.e. the automatic operation) shall be initiated by a manual start control device intended for that 
purpose. The device shall fulfil the requirements of EN 60204-1:2006, 10.6. 
5.4 Basic design considerations 
5.4.1 Stability 
5.4.1.1 Prevention of unintended gravity fall of the beam (down stroking press brakes) 
Where there is a risk of injury (see also 5.1.2.1.3), measures shall be provided to prevent an unintended 
gravity. Such a fall can be due to failure of the hydraulic system, mechanical failure or a failure of the electrical 
control system. The risk shall be prevented by either: 
 a mechanical restraint device; 
 hydraulic restraint device; 
 a combination of a single valve hydraulic restraint device and a mechanical restraint device. 
The restraint device(s) shall operate automatically and shall be effective whenever the tool (i.e. punch) is 
stopped and operator access to the tools area is possible. 
Where mechanical restraint is not used and the risk of injury from a gravity fall exists, the hydraulic restraint 
devices shall consist either of: 
a) two separate hold–up or return cylinders each with a hydraulic restraint device capable of independently 
holding the beam; or 
b) two hydraulic restraint valves fitted to the cylinder outlet using flanged, flared or welded pipe-work, 
capable of holding the beam. Compression fittings and glued rings shall not be permitted (see 5.5.4.1 and 
Figure C.1). The piping between the cylinder and the first restraint valve shall be seamless. 
A single valve hydraulic restraint device or a mechanical restraint device shall be provided as a minimum, on a 
press brake designed solely for automatic operation with interlocking guards with guards locking or use with a 
hold-to-run control device used in conjunction with slow closing speed (see Tables 2 and 3). 
There shall be a system for automatically checking that the restraint system is functioning correctly and no 
press brake stroke shall be possible after any of the systems has failed (see Figure C.1). 
NOTE See also 5.2.6.3 and 5.2.5.1 on the control system requirements to prevent unintended strokes. 
5.4.1.2 Stability of the press brake 
The designer of a press brake shall ensure stability including dynamic loads either by design or by provision of 
fixing points to allow connection to the floor or foundation (see 7.2.2 d)). 
5.4.1.3 Stability of the work piece 
Press brakes shall be provided with adjustable work-piece supports in front of the press brake and back 
gauges. The design of those back gauges, and where rear work-piece supports are provided, shall be such 
that it is impossible to adjust them by reaching through the bending plane. 
5.4.2 Risk of break up during operation 
All fastenings on the press brake, such as screws, nuts or glue joints, shall be assembled in such a way that 
parts will not loosen and cause injury. 
EN 12622:2009 (E) 
41 
5.4.3 Tool holder and tool design 
A press brake shall be designed in such a way that the upper tool can be secured with a form-looking, and not 
solely by friction. The securing of the tools to the press brake shall be achieved either by mechanical fastening 
device(s), or by any other reliable means, ensuring no danger in the event of a fault or a power failure. 
5.4.4 Access to raised work stations or platforms 
Where raised workstations or platforms are provided, they shall be fitted with adequate guard rails, toe-boards 
and safe means of access (see EN ISO 14122-1, EN ISO 14122-2, EN ISO 14122-3). 
5.4.5 Slips, trips and falls 
The press brake shall be designed, constructed and supplied so as to minimise the risk of slips, trips and falls 
in the press brake area, if it is an integral part of the press brake (e.g. by the use of profiled slip-resistant 
flooring). 
5.4.6 Release of trapped persons 
Means and information marked on the machine shall be provided at relevant danger zone and where residual 
risks exist, for the movement of machine axes for emergency purposes (e.g. the release of trapped persons). 
These may include (see EN ISO 12100-2:2003, 6.2 and 5.5.3): 
a) with power off: possibility to freely move the machine parts e.g. back gauges; 
b) with power on: control facilities to start reverse beam motion. 
NOTE See 7.2.2 j) and 7.2.2 p). 
5.4.7 Guarding of drives, transmission machinery and ancillary devices 
Access to drive and transmission machinery and ancillary devices which are an integral part of the press 
brake and are supplied with the press brake shall be prevented. Drive and transmission machinery by means 
of at least one of a) to c) and ancillary devices by means of at least one of a) to d): 
a) fixed guards, where access is required once or less than once per shift (see EN 953:1997, 6.4.1); 
b) movable guards interlocked with the control system, where access is required more than once per shift 
(see 6.4.1 of EN 953:1997); 
c) an interlocking guard with guard locking and delayed unlocking, if the dangerous movement does not 
come to a rest before the danger zone can be reached (see EN 1088:1995, 7.4); 
d) ESPE using AOPD for safeguarding only (see EN 999). For safeguarding the rear side of a press brake 
with AOPD, see 5.1.2.3. 
Interlocking devices shall conform to the requirement of EN 1088:1995, 6.2.1. 
Values against reaching over, reaching under, reaching around and reaching through openings shall be in 
accordance with EN ISO 13857. When reaching over physical barriers, the safety distances shall conform to 
EN ISO 13857:2008, Table 2, over immaterial barriers to EN ISO 13857:2008, Table 1. 
Ancillary devices which are not controlled by the press brake shall be additionally interlocked with the press 
brake control system so that during any intervention no hazardous situation can arise. 
EN 12622:2009 (E) 
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5.5 Protection against non-mechanical hazard 
5.5.1 Noise 
The press brake shall be so designed and constructed that risks resulting from the emission of airborne noise 
are reduced to the lowest level taking account of technical progress and the availability of means of reducing 
noise, in particular at source. When designing a press brake the information and technical measures to control 
noise at source given in EN ISO 11688-1:1998 shall be followed. 
The design shall take into account noise from each source. Appropriate technical measures for reducing noise 
at the main sound sources of the press brake are listed below: 
a) fluid transmission damping facilities; 
b) motor and pump acoustic panels (partial or total), anti-vibration 
mounts; 
c) pneumatic exhaust silencers; 
d) loading and transfer systems acoustic enclosures, damping facilities; 
e) structurally transmitted noise anti-vibration machine mounts. 
Additional or alternative measures giving identical or higher reduction efficiency can be used. In any case, 
declared noise emission values are the decisive criterion for the noise emission of a given machine. 
The measurement of noise emission values shall be made according to EN ISO 11202:1995 and, if required, 
to EN ISO 3746:1995 (or EN ISO 3744:1995); the declaration of noise emission values shall be made 
according to EN ISO 4871:1996 with the use of dual-number form. The minimum information to be provided in 
the test report concerning the measurement of airborne noise emissions is the following: 
a) machine data: 
1) name and address of the manufacturer; 
2) year of construction; 
3) designation of series or type; 
4) serial/prototype number of the press brake under test; 
5) nominal force; 
6) closing and working speed; minimum and maximum if variable speed range; 
b) operating conditions during measurement: 
1) closing and working speed, see D.3 a); 
2) stroke length, see D.3 c); 
3) installation and mounting conditions, see D.1; 
4) force applied in kN, see D.3 b); 
5) pressure applied in MPa during retraction; 
c) measurement: 
1) location of the pressbrake under test, with respect to the reflecting plane, see D.2; 
EN 12622:2009 (E) 
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2) measurement procedure, see D.4; 
3) measurement positions, see D.5; 
4) measurement time, see D.6; 
d) results: 
1) the background sound pressure levels, if the correction factor is required; 
2) the A-weighted emission sound pressure level in the operator's position; 
3) the peak C-weighted emission sound pressure level in the operator's position; 
4) the A-weighted sound power level where the equivalent continuous A-weighted sound pressure level 
in the operator's position exceeds 80 dB (A). 
For additional information on the conditions for noise measurement, see Annex D. 
NOTE Information on noise emission should also be provided in the sales literature. 
5.5.2 Electrical hazards 
EN 60204-1:2006 applies unless otherwise stated in this document. 
The minimum degree of protection for operator interface and press mounted control devices shall be of least 
IP 54 (see EN 60529:1991). 
Enclosures and control gears shall provide a degree of protection of at least IP 54 (see EN 60529:1991). 
5.5.3 Ergonomic and handling 
The press brake and its controls shall be designed according to ergonomic principles (see EN 1005-4 and 
EN ISO 14738) for work posture which is not fatiguing. 
The positioning, labelling and illumination (if necessary) of control devices and facilities for materials and tool 
set handling shall be in accordance with ergonomic principles (see EN 894-1, EN 894-2, EN 894-3 and 
EN 1005-1, EN 1005-2, EN 1005-3). 
Where necessary on the press brake, work stations and the zones in which control devices, guards and 
protective devices are located shall be lit sufficiently to ensure that all work equipment and materials can be 
properly seen, and that eye strain is also avoided (see EN 1837 and 7.2.2, d)). 
Parts of the press which weigh more than 25 kg and require to be lifted with a lifting device shall include 
necessary attachments to accommodate the fitting of a lifting device. See EN 1005-2. 
Tanks containing hydraulic fluid shall be placed or oriented in such a way that the filler and drain pipes can be 
easily reached. 
Further guidance is given in EN 60204-1, EN 614-1, EN 894-2 and EN 894-3. 
NOTE See also bibliography. 
5.5.4 Hydraulic and pneumatic systems 
5.5.4.1 General 
The requirements in EN 982 and EN 983 shall be taken into consideration in designing hydraulic and 
pneumatic systems, which shall comply with the following and the particular requirements in 5.5.4.3. 
Filters and pressure regulators shall be provided. 
EN 12622:2009 (E) 
44 
Devices shall be provided to ensure that the permitted range of working pressure is maintained. 
Pressurised transparent bowls (e.g. of glass and plastic) shall be protected to prevent injury from flying 
particles without affecting visibility. 
All piping, pipe fittings, passages, surge or storage tanks and cored or drilled holes, shall be free from burrs or 
foreign matter which can cause damage to valves or cylinder operating parts. See EN 982:1996, 5.3.4.2.3 and 
EN 983:1996, 5.5.3.3. 
Each run of piping shall, where practicable, be continuous from one piece of apparatus to another. 
Precautions shall be taken (e.g. avoidance of straight rigid piping between connection joints) to prevent 
damage by thermal expansion. Rigid piping shall be supported at frequent intervals to avoid damage from 
movement. Kinking of flexible piping shall be avoided. 
Where a drop in pressure can lead to unintended dangerous motion of the beam, flexible piping shall not be 
used, pipes and pipe connections shall be chosen to prevent such a loss of pressure. Such pipe connections 
shall not be made with compression fittings, glued rings or similar devices. They shall be made by means of 
positive connecting joints or by the welding of two fitted surfaces (see also 5.4.1.1). 
5.5.4.2 Valves 
Operating valves shall not depend on connected piping for support. 
Control valves and other control components (e.g. regulators and pressure gauges) shall be mounted in 
positions which provide adequate accessibility and avoid damage (see EN 982:1996, 5.2.1). 
Where valves are manually or mechanically (as distinct from electrically) operated, the arrangements for 
restoring the valves shall be positive in character (i.e. when the actuator of the valve is released the valve 
shall automatically move to the safe position). 
NOTE The safe position can be the open or closed position of a valve depending upon the well tried principals in the 
hydraulic or pneumatic circuit. 
5.5.4.3 Hydraulic systems 
Controlled gravity descent can be a deliberate design feature to facilitate rapid closing of the tools. In such a 
case, all the oil in the cylinder supporting the beam shall be passed through the main control valve or valves in 
a redundant and monitored system. 
Hydraulic systems which include accumulators shall allow the fluid pressure to fall when the pressure 
generating unit is disconnected from the energy supply; the stored energy shall not allow the initiation of any 
hazardous movement. If this is impossible, the parts of the circuit which are maintained under pressure shall 
be supplied with a manual discharge valve in addition to the other devices (e.g. relief valves, pneumatic 
gauges) required by European Standards or rules concerning accumulators and bear a very clear indication 
(by means of a descriptive plate) of the hazard (see EN 982:1996, 5.3.4.5). 
The circuit shall be protected by a pressure limiting valve(s). These valves shall not be capable of alteration 
without the use of a tool; also they shall be set at a pressure which is no more than 10 % higher than the 
maximum operating pressure. 
For down stroking press brakes, provision shall be made to protect the cylinder and components containing 
the fluid in the lower part of the cylinder from damage due to pressure intensification. A relief valve(s) used for 
this purpose shall be direct operated, sealed and locked against unauthorised adjustment, and shall be set at 
a pressure at least 10 % above the maximum system pressure so that it only opens in the case of a fault. The 
components it protects shall be designed to sustain the pressure at which the valve is set. The relief valve 
shall be constructed so that, if a single break in the spring occurs, the space between the windings remains 
less than one wire thickness. The spring shall be guided so as to maintain the function of the relief valve. 
EN 12622:2009 (E) 
45 
5.5.5 Thermal hazards 
Means such as shielding, insulation shall be provided to prevent burns by accessible parts of the press brake, 
e.g. parts of the hydraulic system, which can reach temperature higher than 63 °C specified in 
EN ISO 13732-1:2008 for a contact time of 4 s. 
5.5.6 Hazards generated by materials and substances 
Hazardous substances shall not be used wherever possible in the construction of the press brake, and the 
use of materials which can cause injury or damage to health shall be eliminated (e.g. asbestos). 
Asbestos linings for brake shall not be used. 
Adequate means shall be provided to prevent the formation of aerosols and respirable oil mists in unhealthy 
concentration, e.g. from oil used to lubricate pneumatic systems. 
5.5.7 Hazards generated by lasers 
If the press brake is fitted with a laser (e.g. to indicate the bending line or measuring angle) the laser shall be 
maximum class 2M in accordance with EN 60825-1:2007. 
5.5.8 High pressure fluid ejection hazards 
Shielding, e.g. screens, shall be provided to flexible piping to reduce the risk (e.g. whiplash, high pressure jet) 
resulting from a failure in the flexible piping system. Shielding shall be up to the height of 2,0 m where the 
flexible piping is not adequately covered with the structures of the press brake. 
5.5.9 Isolation and energy dissipation 
Isolation and energy dissipation shall meet the general requirements of EN ISO 12100-2:2003,4.10 and 5.5.4 
and EN 1037:1995, Clause 5. 
The electrical supply disconnecting device shall be in accordance with EN 60204-1:2006, 5.3 except that the 
disconnecting device shall not be of EN 60204-1:1997, 5.3.2 d) and 5.3.2 e) type. 
Means shall be provided to isolate (disconnect and lock) the pneumatic and hydraulic systems from its energy 
source. Where energy is stored e.g. in a reservoir, pipe or duct, means for dumping of residual pressure shall 
be provided. Such means may include a valve but not the disconnection of pipes. 
5.5.10 Maintenance 
5.5.10.1 See EN ISO 12100-2:2003, 4.15. 
Information for maintenance listed as examples in EN ISO 12100-2:2003, 6.5.1, shall be provided in the 
instruction for use (see 7.2). 
5.5.10.2 Where a platform is required for frequent access e.g. adjustment during tool setting, daily 
inspection or daily lubrication, permanent means of access shall be provided. 
NOTE A fixed platform is not required for infrequent access, e.g. repair. 
5.5.10.3 The press and its safeguarding shall be designed so that periodic examinations can be carried 
out using such tools as are provided with the press. 
NOTE See 5.5.10.2. 
5.5.11 Errors of fitting 
Any part dismountable by the user for setting and maintenance purposes, shall have provision to prevent 
errors of fitting, e.g. pins, asymmetric mounting (see also 7.2). 
EN 12622:2009 (E) 
46 
6 Verification of the safety requirements and/or protective measures 
Table 4 indicates by crosses the method(s) by which the safety requirements and protective measures 
described in Clause 5 shall be verified, together with a reference to the corresponding sub-clauses in this 
European Standard. 
Table 4 — Means of verification of the safety requirements and/or measures for type testing 
Subclause Safety requirement and/or measures for 
type testing 
Visual 
inspectiona 
Performance 
Check/testb 
Measuremenc Drawing 
calculationd 
5.1.1 Prevention of access to moving parts 
5.1.1.2 Fixed enclosing guards X X X 
5.1.1.3 Requirements for guards X X X 
5.1.1.4 ESPE using AOPD X X X X 
5.1.1.4.1 Light curtain X X X 
5.1.1.4.2 Size and positioning of light curtain X X X 
5.1.1.5 Laser actuated AOPD X X X X 
5.1.1.6 Hold to run control X X X 
5.1.1.7 Scanner system (AOPDDR) X X X X 
5.1.2 Location of the safeguarding X X X 
5.2 Control systems - General X X X 
5.2.1 Monitoring and redundancy principles X X X 
5.2.2 Manual control devices X X X 
5.2.3 Failure of power supply X X X 
5.2.4 Protection against external influences X X 
5.2.5.1 Safety functions X X X 
5.2.5.2 Behaviour of the control system X X X 
5.2.5.7 Slow speed X X X 
5.2.5.8 Muting X X X 
5.2.5.10 Emergency stop X X X 
5.2.5.11 Mode selection X X X 
5.2.5.12 Single stroke function X X X 
5.2.6.1 Start X X X 
5.2.6.2 Restart X X X 
5.2.6.3 Reset X X X 
5.2.6.4 Normal stop X X X 
5.2.7 Use of electronic components X X X 
EN 12622:2009 (E) 
47 
Table 4 (continued) 
Subclause Safety requirement and/or measures for 
type testing 
Visual 
inspectiona 
Performance 
Check/testb 
Measuremenc Drawing 
calculationd 
5.2.7.2.2 PES requirement specification X X X 
5.2.7.2.3 PES hardware aspects X X X 
5.2.7.2.4 PES software aspects X X X 
5.3.2 Setting mode 
5.3.3 Production modes 
5.3.3.1 Single cycle manual load and/or unload X X X X 
5.3.3.2 Automatic cycle with automatic load and 
unload 
X X X 
5.4.1 Stability X X X X 
5.4.1.1 Prevention of unintended gravity fall during 
maintenance and repair 
X X X X 
5.4.1.2 Stability of the press brake X X 
5.4.1.3 Stability of the work-piece X X X X 
5.4.2 Risk of break up during operating X X 
5.4.3 Tool holder and tool design X X 
5.4.4 Access to raised work station or platforms X X X 
5.4.5 Slips, trips and falls X X X X 
5.4.6 Release of trapped persons X X 
5.4.7 Guarding of drives, transmission machinery 
and ancillary devices 
X X X 
5.5 Protection against non-mechanical hazard 
5.5.1 Noise X 
5.5.2 Electrical hazards X X X 
5.5.3 Ergonomic and handling X X X X 
5.5.4 Hydraulic and pneumatic systems 
5.5.4.1 Hydraulic and pneumatic systems – 
Common features 
X X X 
5.5.4.2 Valves X X 
5.5.4.3 Hydraulic systems X X X 
5.5.5 Thermal hazards X X X 
5.5.6 Hazards generated by materials and 
substances 
X X X X 
5.5.7 Hazards generated by lasers X X X 
5.5.8 High pressure fluid ejection hazards X X X 
5.5.9 Isolation and energy dissipation X X X 
5.5.10 Maintenance X X X 
5.5.11 Errors of fittings X X X 
7 Information for use 
7.1 Marking X X 
7.2 Instruction handbook X 
 
 
EN 12622:2009 (E) 
48 
 
Table 4 (concluded) 
Subclause Safety requirement and/or measures for 
type testing 
Visual 
inspectiona 
Performance 
Check/testb 
Measuremenc Drawing 
calculationd 
Annex A Safety distances X X X X 
Annex B Overall response time of the hydraulic 
system 
 X X 
a Visual inspection will be used to verify the features necessary for the requirement by visual examination of the components 
supplied. 
b A performance check/test will verify that the features provided perform their function in such a way that the requirement is 
met. 
c Measurement will verify by the use of instruments that requirements are met, to the specified limits. 
d Drawings/calculations will verify that the design characteristics of the components provided meet the requirements. 
 
7 Information for use 
7.1 Marking 
7.1.1 The requirements specified in 6.4 of EN ISO 12100-2:2003 shall be followed. EN 61310-2 shall be 
taken into consideration. 
7.1.2 The press brake shall be marked with the following: 
a) name and address of the manufacturer and, where applicable, of the supplier; 
b) designation of the machine; 
c) designation of series or type; 
d) serial number; 
e) year of construction; 
f) mass of the press brake, without tools or ancillary devices; 
g) mass of the major parts and ancillary devices which are intended to be removed using lifting equipment; 
h) nominal force; 
i) supply data for electrical, hydraulic and pneumatic systems. 
On the front of the press brake: 
j) overall response time and corresponding safety distance(s). See annex A; 
k) any limitation on the type of protective device(s) and mode of operation, for which the press brake is 
suitable; 
l) Instructions for the release of persons trapped between the tools (see 5.3.7); 
m) Warnings against residual risks of crushing hazards between work-piece and parts of the press brake and 
injuries by deflection of protruding work-pieces (5.2.6.3, 5.5.1, 5.1.1.6 and Annex F). 
Protective devices supplied with the press brake shall also be marked with identification data. 
EN 12622:2009 (E) 
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7.2 Instruction handbook 
7.2.1 The requirements specified in 6.5 of EN ISO 12100-2:2003 shall be followed. 
7.2.2 The declaration of noise emission values shall be made according to EN ISO 4871:1996 with the use 
of dual-number form. The instruction handbook shall include the following information: 
a) a repeat of the information with which the press brake is marked (see 7.1.2); 
b) a reference to this European Standard and any other standard used in the design of the press brake; 
c) copies of any EC certification documents and reports on pressure vessel or control system tests; 
d) instructions for safe transportation and installation (floor conditions, foundations, fixing points, services, 
anti-vibration mountings, lighting, etc.); 
e) instructions for how the initial test and examination of the press brake and guarding system shall be 
carried out before first use and being taken into service; 
f) instructions on control systems including circuit diagrams for electrical, hydraulic and pneumatic systems. 
Where a PES is provided, the circuit diagrams shall show the clear relationship at the interface between 
any hardwired part and the PES; 
g) information on noise levels generatedduring the noise test (see 5.5.1); 
h) details of any further protection for the operator which is necessary to deal with residual risks, e.g. 
hearing protection, eye protection, foot protection; 
i) instructions for safe use, setting, trial strokes, maintenance, repair, cleaning and programming (where 
required) on avoidance of danger from all hazards (e.g. gravity falls, ejection hazards created by work-
pieces, tools or parts of them, fluids, deflection of protruding work-pieces); 
j) instructions for the training needed by persons who are appointed to use or prepare press brakes for use, 
including suitable and sufficient instruction in: 
 press brake mechanisms and ancillary devices; 
 the maintenance of fluid quality and filter changes; 
 protective devices; 
 accident causation and prevention; 
 the work of the tool-setter; 
 tool design; 
 handling of work-pieces; 
k) details of any pre-production inspection of the guard or protective device required after tool-setting or 
adjustment of the tools; 
l) specification for any fluid to be used in hydraulic systems and for filters, lubrication, transmission system; 
m) descriptions of foreseeable failure modes and advice on detection, prevention and correction by periodic 
maintenance; 
n) instructions for any test or examination necessary after replacement of components which can affect the 
safety functions; 
o) instructions for periodic maintenance, test and examination of the press brake, guards and protective 
devices, including maintenance, testing and examination intervals. 
In particular: 
EN 12622:2009 (E) 
50 
 the operator shall check the correct setting of the machine and laser actuated AOPD of the device 
with the operating upper tool, regularly and at least at each tool change, by performing the tests in 
Annex G on both sides of the beam with the test piece laying on the sheet to be bent; 
 the operator shall check at each power on and at each tool change and at least every three months 
the stopping performances; 
p) instructions for the use of the means for releasing trapped persons (see 5.4.7); 
q) lifting points for transportation, installation purposes and dismantling; 
r) maximum tool dimensions and mass; 
s) closing and working speed; minimum and maximum if variable speed range; 
t) maximum stroke length; 
u) instructions for working from the side(s) and the possible necessity to arrange additional measures, e.g. 
prevention of access, audible or visible warning (5.1.2.2); 
v) instruction for safe loading, transportation and unloading. 
It is recommended that check lists be prepared for the operations covered by items e), k) and o). In particular, 
for the safety examinations there shall be a specific check list which can be signed by the examiner. 
The instruction for use shall describe the correct selection and use of press brake functions accessible from 
NC panel, e.g. back gauges movement. 
7.3 Commercial informations 
Commercial informations shall at least provide the safeguarding means as described in the instruction 
handbook. 
Commercial documentation shall present the same characteristics and informations as described in the 
instruction handbook. 
EN 12622:2009 (E) 
51 
Annex A 
(normative) 
 
Calculation of minimum safety distances 
A.1 In the front of the press, the minimum safety distance from the danger zone at which AOPDs in the form 
of vertical light curtains (see 5.1.1.4) are mounted, shall be according to the following formula: 
 C t) (K S +×= (A.1) 
where 
S is the minimum distance in mm, from the danger zone to the detection point, line, plane or zone not 
less than 100 mm with a detection capability equal to or less than 14 mm; 
K is a parameter in mm/s, derived from data on approach speeds of the body or parts of the body; 
t is the overall system stopping performance (overall response time) in s; 
C is the additional distance in mm, based on the intrusion towards the danger zone prior to actuation of 
the protective device. 
In the case of press brakes, 
ttttt ∆+++= 32 1 
where 
t1 is the stopping time of the press brake itself (including the response times of the hydraulic and 
electrical control systems - see Annex B); 
t2 is the response time of the safeguarding system; 
t3 is the sum of all other remaining measurable response times; 
∆t is the uncertainty. 
A.2 In order to determine K, an approach speed of 2 000 mm/s shall be used if the minimum distance is 
equal to or less than 500 mm. An approach speed of 1 600 mm/s can be used if the minimum distance is 
greater than 500 mm. 
A.3 When calculating the overall system stopping performance, the following features shall be taken into 
account under the severest normal conditions: 
a) the beam speed on the closing stroke resulting in the longest stopping time; 
b) the influencing temperature of the relevant parts of the system; 
c) the tool mass resulting in the longest stopping time; 
d) the pressure condition resulting in the longest stopping time; 
e) the wear of the relevant parts of the stopping function. 
A.4 When the position of the protective devices which are mechanically linked to the press brake can be 
altered, the devices shall, in order to maintain the minimum distance, be interlocked or capable of being 
locked in position, so that they can only be moved with the use of tools or keys. 
A.5 With regard to the detection capability of vertical format light curtains, the additional distance C in 
Table A.1 shall at least be used when calculating the minimum distance S. 
EN 12622:2009 (E) 
52 
Table A.1 — Additional distance C 
Detection capability 
 
mm 
Additional distance 
C 
mm 
Cycle initiation by 
the light curtain 
≤ 14 
> 14 ≤ 20 
> 20 ≤ 30 
0 
80 
130 
 
Allowed 
> 30 ≤ 40 
> 40 
240 
850 
Not allowed 
A.6 For the overall response time and the related safety distance in respect of horizontal format light 
curtains, see 5.1.1.4.2. 
A.7 For the detection capability in respect of angled format light curtains, see 5.1.1.4.2. 
EN 12622:2009 (E) 
53 
Annex B 
(normative) 
 
The overall response time of the press brake stopping performance 
B.1 When measuring the stopping performance, the machine shall be considered as stopped when the speed 
is below 3 mm/s. 
The overall response time of the beam for each model and size of press brake shall be measured separately 
for each possible operating channel at least ten times during the construction of the press brake. The highest 
measured value or the mean plus three times the standard deviation shall be taken for the comparison. 
If the overall stopping time differs more than 50 % of the stopping speed, it has to be taken into consideration 
for calculation of the safety distance. 
B.2 If the difference is less than 50 %, the overall stopping time measurement can be carried out under 
normal operating conditions and used for the calculation of the safety distance. 
B.3 If the difference exceeds 50 %, the overall response time shall be calculated by dividing the worst case 
stopping by 1,5. This measurement has to be carried out for each individual press brake. 
NOTE The overall response time could change in a defined range when using programmable system. The reaction 
time caused by the programmable system depends mainly on the cycle time of the safety-related program. 
EN 12622:2009 (E) 
54 
Annex C 
(informative) 
 
Example of redundant and monitored hydraulic control circuits for a 
down-stroking press brake 
Figure C.1 illustrates a typical press brake with two cylinders controlled individually. Gravity falls are prevented 
by two valves operating as restraint valves on each cylinder (no mechanical linkage between cylinders). 
 
 
Key 
1 The components in this envelope should, if possible, be 
mounted directly to the bottom of the cylinder to eliminate pipe-
work (5.4.1.3). 
8 Directional control valve - monitored 
2 Cylinder protection (relief) valve setand sealed at 
p2 ≥ P1max + 10 % (see 5.4.4) 
9 Hydraulic restraint valve - monitored 
3 Hydraulic restraint valve - monitored 10 Cylinder protection (relief) valve set and sealed at 
p2 ≥ P1max + 10 % (see 5.4.4) 
4 Directional control valve - monitored 11 The components in this envelope should, if possible, be 
mounted directly to the bottom of the cylinder to eliminate pipe-
work (5.4.1.3). 
5 Safety valve - monitored 12 Machine control 
6 System protection (pressure limiting) valve - set to P1max 
(see 5.4.3) 
13 Protective device 
7 Safety valve - monitored 
Figure C.1 — Example of a redundant and monitored hydraulic control circuit (neither the redundancy 
and monitoring in the electrical circuit nor the slow speed circuit are shown) 
EN 12622:2009 (E) 
55 
Annex D 
(normative) 
 
Conditions for noise measurement of press brakes 
D.1 The installation and mounting conditions shall be representative of the typical or normal use of the 
press brake, and shall be the same for both sound power levels and emission sound pressure levels. 
D.2 The location of the press brake under test shall be documented by means of a sketch giving the 
position and details of any reflecting surfaces likely to influence the noise emission values obtained. 
D.3 The conditions shall be the following: 
a) speeds should be at least 80 % of the maximum; 
b) the force applied should be at least 80 % of the nominal force with tools closed; 
c) the travel should be approximately 80 % of the maximum stroke length. 
D.4 The noise measurement procedure used for obtaining the noise emission values shall be described by 
indicating the measurement procedure and the microphone positions chosen from the options listed in 
EN ISO 11202:1995 and, if necessary, in EN ISO 3746:1995. 
D.5 A sketch of all measurement positions indicating those at which sound pressure levels is recorded, and 
the normal position of the operator(s) shall be included. It can be combined with the description of the press 
brake location mentioned in 5.5.1. 
D.6 Under the operating conditions described in D.3, the measurement time shall last until the A-weighted 
value of the equivalent sound pressure level has stabilised within 1 dB. 
 
EN 12622:2009 (E) 
56 
Annex E 
(informative) 
 
Side safeguarding for manually fed press brakes 
Dimensions in millimetres 
 a) Side view b) Front view 
Key 
1 Beam 
2 Punch 
3 Work-piece support 
4 Bending line 
5 Bending plane 
NOTE Safeguarding methods for the front and rear of the press brake are not shown in this example. 
Figure E.1 — Example of down-stroking press brake with supplementary protective devices 
against reaching into the tools area (see 5.3.2, 5.3.3.2) 
EN 12622:2009 (E) 
57 
Annex F 
(informative) 
 
Markings 
Figure F.1 gives examples for marking the press brake in front of the operator(s) with warnings against the 
residual risks: 
a) crushing hazards between work-piece and parts of the press brake, see Figure F.1 a); 
b) injuries by deflection of protruding work-pieces, see Figure F.1 b); 
c) crushing and shearing hazards between the tools during slow speed and the bending operation, see 
Figure F.1 c). 
 
 
a) b) c) 
 
Figure F.1 — Markings 
EN 12622:2009 (E) 
58 
Annex G 
(normative) 
 
Laser actuated AOPD system tests 
G.1 General 
G.1.1 Initial test: the manufacturer shall carry out the tests in G.3 and G.4 at least ten times before the 
machine is installed. For these tests the manufacturer shall install punch over the full length of the machine. 
G.1.2 Periodic test: the manufacturer shall indicate that the tests in G.2, G.3 and G.4 shall be carried out at 
least once a year with punch installed over the full length of the machine (see 7.2.2 o)). 
G.1.3 Test after tool change: the manufacturer shall indicate that after each change of punch the tests in 
G.2, G.3 and G.4 shall be carried out with the installed upper tools (see 7.2.2 o)). 
NOTE For tests in G.1.3, the punch does not need to be installed over the full length. 
G.2 Test 1: detection capability 
Check the detection capability between the tip of the punch and the laser beam (the nearest to the punch). 
The gap shall be ≤ 14 mm along the complete punch area. 
The test shall be carried out with the handle (cylindrical part) of the test piece (see Figure G.1) 
G.3 Test 2 
A test piece (see Figure G.1) of 10 mm thickness made of flexible material, e.g. plastic lying on the die, shall 
not be touched during down stroke of the punch. In addition, a test piece of 15 mm thickness shall pass 
between the tools 
G.4 Test 3 
A test piece of 35 mm thickness lying on the die shall not be touched during high speed down stroke of the 
beam. 
Dimensions in millimetres 
 
Key 
1 Handle 
Figure G.1 — Test piece 
EN 12622:2009 (E) 
59 
Annex H 
(informative) 
 
Bending speed 
H.1 Bending speed 
Bending speed is the converging speed of the punch and die during the bending process. The bending 
process for this purpose is from the time the punch makes contact with the work piece and until it returns to 
this position after the bending process. 
Bending speed is relevant to the tools used and the material being bent, to ensure a proper bend. 
Figure H.1 gives an example of press brake bending cycle. 
H.2 Safe bending speed 
There is an additional safety requirement that is needed that also determines the bend speed. The outer end 
of the sheet being bent swings through an ark when a bend is being “pressed” into the sheet. Depending on 
the length of this sheet and the width of the die (bottom tool), this “outer end” can move at a dangerous speed 
and in a dangerous position relevant to the press operator. Therefore, to reduce this risk to the operator, a 
requirement is set to limit this bending speed to 10 mm/s. 
Different sheet length (sheet overhang) and different die width’s produce vastly varying end of sheet velocity. 
However, the 10 mm/s bending speed limitation gives a limited safety feature for presses that make a single 
selection of bending speed. 
H.3 Sheet overhang 
Advice shall be given to the press brake operator as to the relevant dangers of the fast moving ends of the 
sheet overhangs. It shall be adequately documented that the speed of the end of the overhang increases with 
the length, and that this increase in length puts it more in the path of the operator. This advice and 
documentation shall be provided in the operating instructions of the press brake. 
H.4 Die width relevant to end of sheet velocity 
The width of the V-die is the other factor that determinates the end of sheet velocity. This is due to the 
distance between the outer edge of the “V” and the centreline of the tip of the punch. The shorter this distance 
(narrower V-die) relevant to a constant bend speed (the descending speed of the punch) the faster the 
resultant speed of the outer edge of the work piece. This is explained in the documentation supplied within the 
operating instructions of the machine. 
 
 
 
EN 12622:2009 (E) 
60 
 
Key 
 S(t) [mm] 
 v(t) [mm/s] 
 AOPD (I = ON / O = OFF) 
 
1 Top dead centre 
2 Approach speed 
3 Slow speed change point 
4 Slow closing speed 
5 Bending speed change point 
6 Bending speed 
7 Bottom dead centre 
8 Return speed 
S Punch edge position [mm] 
t Time (s) 
V1 Beam speed [mm/s] 
V2 Peripheral speed of bent part 
Figure H.1 — Press brake bending cycle – Beam position and speed 
 
EN 12622:2009 (E) 
61 
Annex ZA 
(informative) 
 
Relationship between this European Standard and the Essential Requirements of 
EU Directive 2006/42 
This European Standard has been prepared under a mandate given to CEN by the European Commission 
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the 
New Approach Directive 2006/42/EC 
Once this standard is cited in the Official Journal of the European Union under that Directive and has been 
implemented as a nationalstandard in at least one Member State, compliance with the normative clauses of 
this standard confers, within the limits of the scope of this standard, a presumption of conformity with the 
relevant Essential Requirements of that Directive and associated EFTA regulations. 
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling 
within the scope of this standard. 
EN 12622:2009 (E) 
62 
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[3] EN 842:1996, Safety of machinery — Visual danger signals — General requirements, design and 
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[4] EN ISO 11161:2007, Safety of machinery — Integrated manufacturing systems — Basic requirements 
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