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INSTRUCTION MANUAL 
FOR 
SCREW COMPRESSOR UNIT CONTROLLER 
MYPRO-CPIV 
 
 
 
 
MYPRO-CPIV (standard version) 
 
 
 
 
Read this manual carefully before you can use and service MYPRO-CPIV safely and 
properly. 
 
 
 
 
F1
START
STOP
CLEAR
ALARM
F2 F3 F4 F5 F6 F7
1 2 3
4 5 6
7 8 9
0 . -
ALT
ESC
SAVE ENTER
SH IFT
DELETE
TAB
MYPRO-CPⅣ
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• This manual has been prepared as a guide to allow you to use the Screw Compressor Unit Controller 
MYPRO-CPIV properly and safely. Follow all the instructions in this manual. Failure to do so could result in 
unforeseen accidents. 
• Keep this manual handy for ready and regular reference by all persons working on your MYPRO-CPIV. 
• If the manual is lost or damaged, contact any of the Mayekawa offices or sales/service centers in your area to 
order a new copy. 
• This manual must remain with the product when you resell it to another user. 
• Mayekawa reserves the right to make changes to the specifications of the product the contents of this manual for 
improvements without prior notice. 
• If you have any query due to inconsistency between the product and the information in this manual that can 
result from such changes, please ask questions to any of the Mayekawa offices or sales/service centers in your 
area. 
• Be sure to start operation, inspection, and servicing of the equipment only after having thoroughly read and 
understood all the hazard preventive instructions and precautions in this manual. Almost all the past accidents 
occurred due to failure to follow the basic safety rules. 
 All safety instructions and precautions in this manual are highlighted by appropriate one of the following 
symbol-letter combinations: 
 
 
Indicates a potentially hazardous situation which, if not avoided, will result in death or serious 
injury. 
 
 
 
Indicates a potentially hazardous situation which, if not avoided, could result in death or 
serious injury. 
 
 
Indicates a potentially hazardous situation which, if not avoided, will or could result in minor or 
moderate injury. 
This also indicates an instruction that should be followed to obtain full performance from the 
product. 
 
 
• The safety instructions and precautions in this manual are not exhaustive. There may be other safety 
precautions to be observed that vary from user to user. It is your responsibility to establish a safety management 
system most appropriate for your particular use of the product. 
• Never disassemble or otherwise interfere with the Screw Compressor Unit Controller MYPRO-CPIV, as it 
contains many electronic components that can be adversely affected by disassembly or other interference. 
Mayekawa Mfg. Co., Ltd. assumes no responsibility for any undesirable consequences that would result from 
disassembly of or interference with the controller. 
• Use this controller solely for control and management of the screw compressor units produced by Mayekawa 
Mfg. Co., Ltd. 
 
 
Important Notice 
DANGER 
WARNING 
CAUTION 
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Preface 
 
Thank you for your purchase of Mayekawa Screw Unit Controller MYPRO-CPIV (hereafter called ‘CP4’ in this manual). 
 
Before installing and putting your CP4 into service, check the following points: 
 
a. Is your CP4 exactly of the factory-option variation you specified? 
 
CP4 is available from the following 12 factory-option variations: 
 
CPIV-110 (standard version): 16 digital inputs/outputs; 16 analog inputs; 2 communication ports 
CPIV-111: 16 digital inputs/outputs; 16 analog inputs; 4 analog outputs; 2 
communication ports 
CPIV-110C: 16 digital inputs/outputs; 16 analog inputs; 2 communication ports; 2 
extension communication ports 
CPIV-111C: 16 digital inputs/outputs; 16 analog inputs; 4 analog outputs; 2 
communication ports; 2 extension communication ports 
CPIV-210: 32 digital inputs/outputs; 16 analog inputs; 2 communication ports 
CPIV-211: 32 digital inputs/outputs; 16 analog inputs; 4 analog outputs; 2 
communication ports 
CPIV-210C: 32 digital inputs/outputs; 16 analog inputs; 2 communication ports; 2 
extension communication ports 
CPIV-211C: 32 digital inputs/outputs; 16 analog inputs; 4 analog outputs; 2 
communication ports; 2 extension communication ports 
CPIV-220: 32 digital inputs/outputs; 32 analog inputs; 2 communication ports 
CPIV-221: 32 digital inputs/outputs; 32 analog inputs; 4 analog outputs; 2 
communication ports 
CPIV-220C: 32 digital inputs/outputs; 32 analog inputs; 2 communication ports; 2 
extension communication ports 
CPIV-221C: 32 digital inputs/outputs; 32 analog inputs; 4 analog outputs; 2 
communication ports; 2 extension communication ports 
 
b. Are all necessary items supplied? 
Check the items in the package against the packaging list. 
The standard version CP4 should be provided with a set of the following items: 
Control panel enclosure, analog input boards (AI10, AI11); connection cable (1-meter long C1200); digital 
input/output board (OIA0); connection cable (1-meter long C1300); power cables (1.2-meter long C0312 x 
2, 1.2-meter long C0322 x 1); noise filter (rating: 250 VAC, 6 A); instruction manual (one copy of this 
manual) 
 
c. Are the settings in the following windows correct? 
Be sure to confirm the following settings in the corresponding windows before putting CP4 into service. 
 
‘SETUP’ menu windows (F6): Are the settings for the ‘OPTION SETUP’ items appropriate for the 
compressor unit under control? (see Chapter 4) 
‘ADJUSTMENT’ menu windows (F5): Is the scaling setting for each sensor correct? (see Chapter 5) 
‘LIMITS’ menu windows (F3): Are the settings for each alarm appropriate? (see Chapter 7) 
‘SETPOINT’ menu window (F1): Are the start/stop (‘CUT IN / CUT OUT’) settings appropriate? (see 
Chapter 6) 
 
 
Mayekawa Mfg. Co., Ltd. 
QT108300 
 
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Table of Contents 
Preface .........................................................................................................................................................................................2 
Table of Contents..........................................................................................................................................................................3 
Chapter 0 Information on This Manual..........................................................................................................................................6 
0.1 This Manual and Other Related Manuals .......................................................................................................................6 
0.2 Organization of This Manual...........................................................................................................................................6 
0.3 Glossary of Special Terms..............................................................................................................................................7 
0.4 Units ...............................................................................................................................................................................8 
0.5 Words Displayed on Screen ...........................................................................................................................................8 
0.6 Acronyms and Abbreviations..........................................................................................................................................8 
Chapter 1 General Description .....................................................................................................................................................9 
1.1 Functions and Features..................................................................................................................................................9 
1.2 Menu-Window Organization (Menu Tree).......................................................................................................................91.3 Usable Control Functions Depending on Selected Factory Options.............................................................................11 
Chapter 2 Components and Their Functions ..............................................................................................................................13 
2.1 Front Panel...................................................................................................................................................................13 
2.2 Parts on CPU Board (REF-CX100-PR01) ....................................................................................................................15 
2.2.1 Reset Switch on CPU Board................................................................................................................................17 
2.2.2 Replacement of Memory Backup Battery on CPU Board .....................................................................................18 
2.3 EPROM Board (REF-CX100-RM01) ............................................................................................................................19 
2.3.1 Replacement of EPROM on CPU Board ..............................................................................................................20 
2.4 Analog Input Boards (REF-CX100-AI01, REF-CX100-AI11) ........................................................................................21 
2.4.1 Current / Voltage Selection and Terminal Block Connections for Analog Input Boards .........................................22 
2.4.2 Input Type Selection for Channels 15 and 16 of Analog Input Boards ..................................................................23 
2.5 Optional Analog Output Board (REF-CX100-DA01) .....................................................................................................24 
2.6 Optional Digital Input/Output Drive Base (DB) Board (REF-CX100-DB01) ..................................................................25 
2.7 Digital Input/Output Board (REF-MCS200-OIA0, REF-MCS200-OIE0 (Optional)) .......................................................26 
2.8 Optional Communication Board (REF-CX100-RS01)...................................................................................................27 
2.9 Optional Analog-to-Digital (AD) Converter Board (REF-CX100-AD01) ........................................................................28 
Chapter 3 Operation ...................................................................................................................................................................29 
3.1 Display Screens ...........................................................................................................................................................29 
3.1.1 Acronyms and Abbreviations Used for Indicated Items.........................................................................................29 
3.1.2 Main Graphic Screen ............................................................................................................................................32 
3.1.3 Main Status Screen...............................................................................................................................................33 
3.2 To Make Settings – Selection from Options..................................................................................................................39 
3.3 To Make Setting – Entry Using Keys ............................................................................................................................40 
3.4 Software Resetting Method ..........................................................................................................................................42 
3.5 Special Booting.............................................................................................................................................................43 
Chapter 4 Setups (‘SETUP’ Menu (F6))......................................................................................................................................46 
4.1 Setting in ‘SYSTEM SETUP’ Window (Option 1 of ‘SETUP’ Menu (F6)) ......................................................................46 
4.2 Settings in ‘ANALOG INPUT SCALING’ Window (Option 2 of ‘SETUP’ Menu (F6)).....................................................48 
4.3 Settings in ‘OPTION ANALOG INPUT’ Window (Option 3 of ‘SETUP’ Menu (F6)).......................................................49 
4.4 Settings in ‘OPTION SETUP 1/2’ Window (Option 4 of ‘SETUP’ Menu (F6)) ...............................................................51 
4.5 Setting in ‘OPTION SETUP 2/2’ Window (Option 5 of ‘SETUP’ Menu (F6)) .................................................................53 
4.6 Settings in ‘OPTION SELECT’ Window (Option 6 of ‘SETUP’ Menu (F6)) ...................................................................55 
Chapter 5 Adjustments (‘ADJUSTMENT’ Menu (F5)) .................................................................................................................57 
5.1 Settings in ‘SLIDE VALVE SETUP’ Window (Option 1 of ‘ADJUSTMENT’ Menu (F5)) ................................................57 
5.2 Settings in ‘SET TIME’ Windows (Option 2 of ‘ADJUSTMENT’ Menu (F5)) .................................................................66 
5.3 Settings in ‘PASSWORD’ Window (Option 3 of ‘ADJUSTMENT’ Menu (F5)) ...............................................................68 
5.4 Settings in ‘ANALOG INPUT ADJUSTMENT’ Window (Option 4 of ‘ADJUSTMENT’ Menu (F5)) ................................69 
5.5 Settings in ‘ANALOG OUTPUT ADJUSTMENT’ Window (Option 5 of ‘ADJUSTMENT’ Menu (F5)) ............................70 
5.6 Settings in ‘ANALOG OUTPUT ASSIGNMENT’ Window (Option 6 of ‘ADJUSTMENT Menu (F5))’.............................71 
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5.7 Settings in ‘AUXILIARY INPUT TIMER’ Window (Option 7 of ‘ADJUSTMENT’ Menu (F5)) .........................................74 
5.8 Adjustments in ‘COMMUNICATION SETUP’ Window (Option 8 of ‘ADJUSTMENT’ Menu (F5)) .................................75 
Chapter 6 Control Selections (‘SETPOINTS’ Menu (F1)) ...........................................................................................................77 
6.1 Settings in ‘OPERATION MODE’ Window (Option 1 of ‘SETPOINTS’ Menu (F1)) .......................................................77 
6.2 Manual Control from ‘D/O TEST OPERATION’ Window (Option 2 of ‘SETPOINTS’ Menu (F1))..................................78 
6.3 Settings in ‘SET POINTS’ Window (Option 3 of ‘SETPOINTS’ Menu (F1)) ..................................................................80 
6.4 Settings in ‘SCHEDULER’ Window (Option 4 of ‘SETPOINTS’ Menu (F1)) .................................................................81 
6.5 Setting in ‘OTHER SETPOINT’ Window (Option 5 of ‘SETPOINTS’ Menu (F1))..........................................................84 
6.6 Settings in ‘AUTO Vi’ Window (Option 6 of ‘SETPOINTS’ Menu (F1)) .........................................................................86 
6.7 Settings in ‘AUTO STAGE’ Window (Option 7 of ‘SETPOINTS’ Menu (F1)).................................................................88 
Chapter 7 Alarms (‘LIMITS’ Menu (F3)) ......................................................................................................................................95 
7.1 Settings in ‘ALARM/FAILURE’ Windows 1/3 to 3/3 ......................................................................................................95 
7.1.1 ‘ALARM/FAILURE 1/3’ Window ............................................................................................................................95 
7.1.2 ‘ALARM/FAILURE 2/3’ Window ............................................................................................................................97 
7.1.3 ‘ALARM/FAILURE3/3’ Window ............................................................................................................................98 
7.2 Settings in ‘OEM LIMITS 1/2’ and ‘OEM LIMITS 2/2’ Windows (Options 4 and 5 of ‘LIMITS’ Menu (F3)) ....................99 
7.2.1 ‘ALARM/FAILURE & OEM LIMITS 1/2’ Window ...................................................................................................99 
7.2.2 ‘ALARM/FAILURE & OEM LIMITS 2/2’ Window .................................................................................................100 
7.3 Settings in ‘RANGE OVER’ Window (Option 6 of ‘LIMITS’ Menu (F3)) ......................................................................100 
Chapter 8 Operation .................................................................................................................................................................102 
8.1 Control of Compressor Unit Operation .......................................................................................................................102 
8.1.1 Start/Stop Control in Different Operation Control Modes.....................................................................................102 
8.1.2 Compressor Capacity Control Settings in ‘CAPACITY CONTROL’ Window 
(Option 1 of ‘CONTROLLER’ Menu (F2)) ............................................................................................................104 
8.1.3 Settings in ‘VFD COMPRESSOR CONTROL’ window (Option 2 of ‘CONTROLLER’ Menu (F2)) ......................107 
8.1.4 Settings in ‘VFD SETUP’ Window (SHIFT 3 of ‘CONTROLLER’ Menu (F2))......................................................108 
8.1.5 Settings in ‘CONDENSER CONTROL’ Window (Option 0 of ‘CONTROLLER’ Menu (F2)).................................109 
8.2 Communications.........................................................................................................................................................112 
8.2.1 System Configuration .........................................................................................................................................112 
8.2.2 Remote Communication Device and Communication Protocols.........................................................................112 
8.2.3 Connecting Communication Terminating Resistors ............................................................................................113 
8.2.4 MODBUS Protocol..............................................................................................................................................114 
Chapter 9 Maintenance (‘LOGS’ Menu (F4)) ............................................................................................................................116 
9.1 Display in ‘TRENO LOG’ Window (Option 1 of ‘LOGS’ Menu (F4))............................................................................116 
9.2 Display in ‘TREND GRAPH’ Window (SHIFT 1 of ‘LOGS’ Menu (F4)) .......................................................................117 
9.3 Settings in ‘GRAPH ASSIGNMENT’ Window (SHIFT2 of ‘LOGS’ Menu (F4))............................................................118 
9.4 Displays in ‘ALARM LOG’ Window (Option 2 of ‘LOGS’ Menu (F4)) ..........................................................................119 
9.5 Display in ‘EVENT LOG’ Window (Option 3 of ‘LOGS’ Menu (F4)).............................................................................121 
9.6 Display in ‘DEVICE COUNTER MONITOR’ Window (Option 4 of ‘LOGS’ Menu (F4)) ...............................................122 
9.7 Resetting Made in ‘DEVICE COUNTER SET’ Window (Option 5 of ‘LOGS’ Menu (F4) )...........................................123 
Chapter 10 Analysis (‘DIAGNOSTIC’ Menu (F7)) .....................................................................................................................124 
10.1 Display in ‘SHOW SYSTEM SETUP’ Window (Option 1 of ‘DIAGNOSTIC’ Menu (F7)) ..........................................124 
10.2 Display in ‘SHOW ANALOG INPUT SCALINGT’ Window (Option 2 of ‘DIAGNOSTIC’ Menu (F7)).........................124 
10.3 Display in ‘SHOW OPTION ANALOG INPUT’ Window (Option 3 of ‘DIAGNOSTIC’ Menu (F7)).............................125 
10.4 Display in ‘SHOW DIGITAL I/O STATUS’ Window (Option 4 of ‘DIAGNOSTIC’ Menu (F7)) ....................................125 
10.5 Display in ‘SHOW OPTION SETUP 1/2’ Window (Option 5 of ‘DIAGNOSTIC’ Menu (F7)) .....................................126 
10.6 Display in ‘SHOW OPTION SETUP 2/2’ Window (Option 6 of ‘DIAGNOSTIC’ Menu (F7)) .....................................126 
10.7 Display in ‘SHOW PROGRAM VERSION’ Window (Option 7 of ‘DIAGNOSTIC’ Menu (F7)) ..................................127 
10.8 Display in ‘READ REGISTER’ Window (Option 8 of ‘DIAGNOSTIC’ Menu (F7)).....................................................127 
10.9 Display in ‘READ BIT’ Window (Option 9 of ‘DIAGNOSTIC’ Menu (F7)) .................................................................128 
10.10 Display in ‘READ TIMER/COUNTER’ Window (Option 0 in ‘DIAGNOSTIC’ Menu (F7)) .............................................128 
Chapter 11 Troubleshooting......................................................................................................................................................129 
Chapter 12 Specifications .........................................................................................................................................................133 
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Device List ............................................................................................................................................................................136 
List of Replaceable Parts ......................................................................................................................................................242 
Software Revision Record 1..................................................................................................................................................243 
Software Revision Record 2..................................................................................................................................................244 
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Chapter 0 Information on This Manual 
 
0.1 This Manual and Other Related Manuals 
This manual is one of the four manuals each containing information about MYPRO-CPIV (CP4) as follows: 
 
- COMPRESSOR CONTROL PANEL (Model MYPRO-CPIV/E) MANUAL 
Contains information necessary for the engineering staff in charge of operation, maintenance, and communications of CP4. 
The information includes description on the CP4’s functions and specifications, instructions for wiring/connections, setting and 
operation, method for troubleshooting, and other data necessary for maintenance service. 
 
- MYPRO-CPIV (MYCOM SCREW UNIT CONTROLLER) MANUAL 
Provides information on transportation, installation, setting up for operation, maintenance, and disposal of the MYCOM Screw 
Compressor Unit Control Panel Model MYPRO-CPIV/E. 
 
- MYPRO-CPIV (MYCOM SCREW UNIT CONTROLLER) START-UP MANUAL 
Describes the start-up procedures of CP4 in a simplified form, beginning with the initialization. 
 
- MYPRO-CPIV (MYCOM SCREW UNIT CONTROLLER) FACTORY MANUAL 
Contains instructions for the setting to be made on CP4 before shipment from the factory. 
 
0.2 Organization of This Manual 
This manual consists of the following three groups of chapters. 
 
Chapters 1 to 3 
These chapters contain the following introductory information for the use of CP4. 
Chapter 1 shows the function menus (hereafter simply called “menu”) and the function windows (hereafter simply called 
“windows”) that can be accessed from each menu (menu tree). The functions available as factory options are also shown in 
this chapter. 
Chapter 2 contains the following items of information about CP4: thefunctions and operation of the individual keys on the front 
panel; description of the CPU board including the operations you need to perform on it; and the optional extension circuit 
boards. 
Chapter 3 contains the following items of information: how to make appear a desired display on the front panel screen and read 
the displayed data; how to make selections or entries to set parameters; and how to perform “special booting” required when 
making some settings and initialization/resetting. 
 
Chapters 4 to 10 
These chapters contain detailed description of individual windows, including the methods of setting for the parameter items in 
each window, limitations applied to certain settings, and detailed explanation of special function-related items, such as the 
communication protocol, automatic staging (AUTO STAGE) control, etc. 
 
Chapters 11 and 12 
Chapter 11 provides troubleshooting information. 
Chapter 12 contains the specifications and other miscellaneous information including the replacement parts list, software 
version list, device lists etc. 
 
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0.3 Glossary of Special Terms 
The special terms used in this manual are defined below. 
 
ALARM 
ALARM is a non-critical alarm that does not involve any compressor unit shutdown. 
 
Automatic staging control (AUTO STAGE) 
The automatic staging control works on multiple compressor units with their CP4s inter-connected through communication 
ports. Of these CP4s, one is assigned to the “master station”. The master station issues commands to start or stop the 
compressor under control of each of the other CP4s (called the “slave stations”) to properly adjust the number of operating 
compressors according to the required gas compressing capacity for the refrigerating system. 
 
Compressor unit 
Compressor unit refers to a system consisting of a compressor, condenser, expansion values, chiller, and driving motors. 
Each compressor unit operates under control of one CP4. 
 
FAILURE 
FAILURE is a critical alarm that involves compressor unit shutdown. 
 
Hardware key 
The hardware key is a special device that is not supplied with the product. It is used for adjustments necessary before 
shipment of the product from the factory. 
 
Main Graphic Screen 
This screen appears first when CP4 is turned on and shows the compressor’s status using graphics. 
 
Main Status Screen 
This screen shows the compressor’s status using alphanumeric characters. This screen appears when the TAB key is pressed 
on the front panel when the Main Graphic Screen is displayed. 
 
Manipulating value 
The amount of control expressed in a sum of the proportional, integral, and derivative controls (PID control) concerning with 
the capacity, speed, and other controls. 
 
Mask time 
Mask time refers to the time set by the user during which no determination to or not to issue an alarm takes place. 
 
Master station 
“Master station” is defined differently according to the control configuration using PC4s. 
- In the case of the automatic staging control (AUTO STAGE), the master station is the CP4 that gives operational commands 
to the other CP4s according to information of its own as well as that it receives from the slave CP4s. 
- In the case of the control using a remote control device such as a computer through communications, the master station 
refers to the remote control device controlling the CP4s in the network. 
 
Menu 
Each function of CP4 has a menu that provides options to make access to individual windows. Each menu can be selected by 
pressing one of the function keys on the front panel. 
 
OEM limit 
OEM limit refers to the upper or lower limit of each alarm set value. 
 
 
 
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Offset 
If analog input values are too small or too large for processing over the entire range of measurement, a positive or negative 
offset value is added for proper processing and indication. You can specify offset values as part of settings. 
 
Passwords 
You must enter a password of the specified level before you can make settings in some special windows. Three different levels 
of password (LEVEL-1, LEVEL-2, and LEVEL-3) must be registered beforehand to be able to access these windows, each 
requiring a specific level of password for authorization. See Section 5.3 Settings in ‘PASSWORD’ Window (Option 3 of 
‘ADJUSTMENT’ Menu (F5)) for further details. 
 
Scaling 
Scaling means a setting to specify the range (upper and lower limits) for input values from each sensor. 
 
Special booting 
Special booting is the method for booting CP4 that is required before performing the system setup and initializing individual 
control settings. 
 
Trimming data 
With CP4, “trimming,” means “output adjustment”. The value for the adjustment is written in a non-volatile memory. 
 
Window 
A screen that is accessed from each menu. It is used for making parameter settings and for checking the status of settings or 
operation of the compressor unit. Some windows include multiple sub-windows. 
 
0.4 Units 
Unless otherwise specified, all pressures are indicated in MPa (gauge readings) and temperatures in °C. 
 
0.5 Words Displayed on Screen 
In this manual, the words displayed on the screen (menus, windows, parameter items, selective options, etc.) are indicated in all 
capital letters enclosed by single quotation marks like ‘SETUP’ (although quotation marks are basically omitted in tables). 
 
0.6 Acronyms and Abbreviations 
For interpretation of the acronyms and abbreviations used in display, see Section 3.1 Display Screens. 
 
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Chapter 1 General Description 
 
1.1 Functions and Features 
CP4 is a controller developed for controlling operation of the Mayekawa-produced screw compressor units. 
The controller has the following standard features: 
 
• Sequence control and process control inputs/outputs 
- 16 digital inputs/outputs No-voltage contact signals or under-voltage solid-state relay (SSR) signals 
- 16 analog inputs 4 to 20 mA DC inputs, 1 to 5 V DC inputs, or 1-kΩ potentiometer inputs 
 
• User-controller interface 
- Backlit color LCD capable of displaying 80 digits x 30 lines alphanumeric characters 
- Keypad with numeric keys, function keys, and control keys (33 keys in total) 
 
The LCD can collectively display multiple measurements and concurrently display settings and actual measurements. The 
key groups are arranged efficiently, allowing easy screen switching and change of settings. 
 
• Communication ports 
The following communication ports are standard provisions: 
- One serial communication port with a round connector conforming to special-purpose RS-232C 
- One half-duplex, 4-wire serial communication port conforming to RS-485 
 
The serial communications function allows remotely monitoring the operating conditions of compressor units, making their 
start/stop control, and changing various parameter settings. The MODBUS protocol employed is world standard protocol 
for serial communications in industry and allows for the use of commercially available supervisory control and data 
acquisition (SCADA) software as well as connection to and communication with PLC MODBUS communications units of 
various manufacturers. 
 
• Optional extension boards for additional inputs/outputs channels and communication ports 
The following optional items are available for expanded connections to CP4. 
- Extension digital/analog converter (DA) board for additional 4 analog outputs 
- Extension analog input board for additional 16 analog inputs 
- Extension digital input/output board for additional 14 digital output channels and 2 digital input channels 
- Extension communication board for additional 2 communication ports 
 
• Either of two status windows is selectable: “Main Graphic” and “Main Status”. (A function key is used on the menu screen for 
selecting each window.) 
 
1.2 Menu-WindowOrganization (Menu Tree) 
The individual function menus are associated with the function keys F1 to F7 (see Section 2.1). Each menu includes the windows 
to which specific names are given together with Option numbers as shown below. 
The section number in parentheses after each window menu indicates the section of this manual containing the information on 
the window. 
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Menu Tree 
 
 
 
1. OPERATION MODE (Section 6.1) 
2. D/O TEST OPERATION (Section 6.2) 
3. SET POINTS (Section 6.3) 
4. SCHEDULER (Section 6.4) 
5. OTHER SET POINTS (Section 6.5) 
6. AUTO Vi (Section 6.6) 
7. AUTO STAGE (Section 6.7) 
 
1. CAPACITY CONTROL (Section 8.1.2) 
2. VFD COMPRESSOR CONTROL (Section 8.1.3) 
3 .HIGH STAGE CONTROL 
4. EXPANSION VALVE (SH) CONTROL 
 (4.LIQUID SUPPLY CONTROL) 
5. EXPANSION VALVE (SP) CONTROL 
6. EXPANSION VALVE (LB) CONTROL 
7. ECONOMIZER/INTER COOLER EXPANSION 
 VALVE CONTROL 
 (7.ECONOMIZER/INTERCOOLER SV) 
8. LIQUID INJECTION OIL COOLING 
 (8.LIQUID INJECTION SV) 
9. CHILLER LB TEMPERATURE CONTROL 
0. CONDENSER CONTROL (Section 8.1.5) 
SHIFT1. LEVEL CONTROL 
SHIFT3. VFD SETUP (Section 8.1.4) 
1. ALARM/FAILURE 1/3 (Section 7.1) 
2. ALARM/FAILURE 2/3 (Section 7.1) 
3. ALARM/FAILURE 3/3 (Section 7.1) 
4. OEM LIMITS 1/2 (Section 7.2) 
5. OEM LIMITS 2/2 (Section 7.2) 
6. RANGE OVER (Section 7.3) 
 
1. TREND LOG (Section 9.1) 
2. ALARM LOG (Section 9.4) 
3. EVENT LOG (Section 9.5) 
4. DEVICE COUNTER MONITOR (Section 9.6) 
5. DEVICE COUNTER SET (Section 9.7) 
SHIFT1. TREND GRAPH 
SHIFT2. GRAPH ASSIGNMENT 
1. SLIDE VALVE SETUP (Section 5.1) 
2. SET TIME (Section 5.2) 
3. PASSWORD (Section 5.3) 
4. ANALOG INPUT ADJUSTMENT (Section 5.4) 
5. ANALOG OUTPUT ADJUSTMENT (Section 5.5) 
6. ANALOG OUTPUT ASSINGMENT (Section 5.6) 
7. AUXILIARY INPUT TIMER (Section 5.7) 
8. COMMUNICATION SETUP (Section 5.8) 
 
1. SYSTEM SETUP (Section 4.1) 
2. ANALOG INPUT SCALING (Section 4.2) 
3. OPTION ANALOG INPUT (Section 4.3) 
4. OPTION SETUP 1/2 (Section 4.4) 
5. OPTION SETUP 2/2 (Section 4.5) 
6. OPTION SELECT (Section 4.6) 
1. SHOW SYSTEM SETUP (Section 10.1) 
2. SHOW ANALOG INPUT SCALING (Section 10.2) 
3. SHOW OPTION ANALOG INPUT (Section 10.3) 
4. SHOW DIGITAL I/O STATUS (Section 10.4) 
5. SHOW OPTION SETUP 1/2 (Section 10.5) 
6. SHOW OPTION SETUP 2/2 (Section 10.6) 
7. SHOW PROGRAM VERSION (Section 10.7) 
8. READ REGISTER (Section 10.8) 
9. READ BIT (Section 10.9) 
0. READ TIMER/COUNTER (Section 10.10) 
“Main Graphic” and “Main Status” windows 
F1 SETPOINTS 
F2 CONTROLLER 
F3 LIMITS 
F4 LOGS 
F5 ADJUSTMENT 
F6 SETUP 
F7 DIAGNOSTIC 
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1.3 Usable Control Functions Depending on Selected Factory Options 
You can use any control functions listed in the ‘OPTION SETUP’ column in the table below according to your selection in the 
‘Item’ column if the corresponding functions in the ‘OPTION SELECT’ column have been enabled for your specific CP4 before its 
shipment from the factory (factory option). Any setups you make is invalid if they are for those ‘OPTION SETUP’ items that 
correspond to the disabled ‘OPTION SELECT’ functions. You cannot enable any disabled ‘OPTION SELECT’ functions yourself. 
(see Chapter 4 for details of the ‘OPTION SELECT’ and ‘OPTION SETUP’ windows) 
 
NOTE: 
In the table below, marked * in the “Item” column are the default selections. 
 
Usable Control Functions 
‘OPTION SELECT’ ‘OPTION SETUP’ Item 
* NONE 
 DIGITAL ‘REMOTE CAPACITY CONTROL’ REMOTE CAPACITY CONTROL 
 ANALOG 
* NOT USE 
CONDENSER CONTROL 
 USE 
* LOCAL DISCHARGE PRESSURE 
CONDENSER VFD CONTROL 
CONDENSER CONTROL TARGET 
 SYSTEM DISCHARGE PRESSURE
* NOT USE 
CONDENSER CONTROL 
 USE 
* LOCAL DISCHARGE PRESSURE 
CONDENSER CONTROL TARGET 
 SYSTEM DISCHARGE PRESSURE
* ON/OFF SIGNAL SET 
CONDENSER 3STEPS CONTROL 
 
or 
 
CONDENSER 6STEPS CONTROL 
 CONDENSER CONTROL METHOD 
 ON/OFF MULTI SET 
* NOT USE 
CHILLER CONTROL 
 USE 
* 1 
 2 LIQUID SUPPLY SV 
 3 
 NONE/THERMAL EXPANSION 
 YOSAKU 1-VALVE 
 YOSAKU 2-VALVES 
 YOSAKU 3-VALVES 
* 1-MOTORIZED CONTROL VALVE 
EXPANSION VALVES 
 2-MOTORIZED CONTROL VALVES
* NO 
CHILLER GAS TEMP. SENSOR 
 YES 
* NO 
CHILLER ENTERING TEMP. SENSOR
 YES 
* NO 
CHILLER LEAVING TEMP. SENSOR 
 YES 
* NOT USE 
CHILLER LEAVING TEMP. CONTROL
 USE 
 CONTINUOUS 
CHILLER CONTROL 
CHILLER PUMP MODE 
* AUTO START/STOP 
* NOT USE AUTO STAGING 
(Control of the number of operating 
compressors) 
AUTO STAGER 
 2 UNITS - 8 UNITS 
* NOT USE 
VFD COMPRESSOR 
 USE 
* NOT USE 
VFD COMPRESSOR 
(Inverter control) 
VFD COMPRESSOR OUTPUT LIMIT 
 USE 
QT108300 
 
- 12 - 
 
Usable Control Functions (continued) 
‘OPTION SELECT’ ‘OPTION SETUP’ Item 
* NOT USE HIGH STAGE CAPACITY CONTROL 
(Control of the high stage capacity of 
compound type two stage 
compressors) 
HIGH STAGE CAPACITY CONTROL 
 USE 
* NOT USE 
 USE Y10,11,12,16,17(UD-V) 
 USE Y19,1A,1B,1C,1D(UD-V) 
AUTO Vi CONTROL AUTO Vi CONTROL 
 USE J SERIES 
* NOT USE LIQUID INJECTION OIL COOLING 
CONTROL USE 
 NONE/THERMAL EXPANSION 
* YOSAKU 1-VALVE 
 YOSAKU 2-VALVES 
INJECTION VALVES 
 MOTORIZED CONTROL VALVE 
* DISCHARGE TEMPERATURE 
LIQUID INJECTION CONTROL 
(Oil cooling control) 
CONTROL TARGET 
 DISCHARGE SUPERHEAT 
* NOT USE 
HOT GAS BYPASS CONTROL HOT GAS BYPASS CONTROL 
 USE 
* NOT USE 
STARTING BYPASS CONTROL STARTING BYPASS CONTROL 
 USE 
* LSV & SP ECONOMIZER/INTERCOOLER 
 LIQUID SUPPLY CONTROL HSV & IP 
* NOT USE ECONOMIZER/INTERCOOLER 
 EXPANSION VALVE CONTROL USE 
 NONE 
* YOSAKU 
ECONOMIZER/INTERCOOLER 
EXPANSION VALVE CONTROL 
EXPANSION VALVES 
 MOTORIZED CONTROL VALVE 
* NOT USE LEVEL CONTROL 
(Liquid level control) 
LEVEL CONTROL 
 USE 
* NOT USE 
COMPRESSOR OIL SEAL CONTROL COMPRESSOR OIL SEAL CONTROL
 USE 
400 SERIES COMPRESSOR 
CONTROL 
--- --- 
* LOCAL SUCTION PRESSURE 
 SYSTEM SUCTION PRESSURE 
 CHILLER ENTERING 
TEMPERATURE 
--- 
CONTROL TARGET (CUT IN/OUT) 
(Target of start/stop control) 
 CHILLER LEAVING 
TEMPERATURE 
* LOCAL SUCTION PRESSURE 
 SYSTEM SUCTION PRESSURE 
 CHILLER LEAVING 
TEMPERATURE 
 COMBINED LOCAL SP/LB 
 COMBINED SYSTEM SP/LB 
 LOCAL DISCHARGE PRESSURE 
--- 
CONTROL TARGET (CAPACITY 
CONTROL) 
(Target of capacity control) 
 SYSTEM DISCHARGE PRESSURE
 
QT108300 
 
- 13 - 
 
Chapter 2 Components and Their Functions 
 
2.1 Front Panel 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Keys on Front Panel 
No. Key Function 
1 Function keys Press one of the F1 to F7 keys to display the corresponding menu. If you press the same 
function key while the menu is displayed, the menu will close (see Section 1.1 for the 
key-to-menu correspondence). 
2 ESC key Press this key to close a menu or window. 
3 SHIFT key Press this key in combination with an arrow key to make an up-down or right-left shift 
between items in the same window. (This key has no effect when pressed independently.)
4 ALT key Press this key in combination with the TAB key to make a shift between items across 
different windows/windows or with the SHIFT key to make a shift between items within the 
same window/window (it has no effect when pressed independently). 
5 DELETE key Use this key when correcting entries. 
6 Arrow keys Use these keys to move the cursor (in reverse video) from one item to another within a 
menu or window. 
7 TAB key Use this key to move the cursor (in reverse video) from an item in a window/sub-window to 
an item in another window/sub-window. 
8 ENTER key Used to confirm a selection or entry. 
When confirmed by pressing this key, the selected option or entry turns red. 
Even when confirmed, the selection or entry is not saved in memory. 
9 SAVE key Pressing this key saves selections or entries in memory. 
Stored in memory are the new/altered selections or entries that have been confirmed by 
pressing the ENTER key. 
The characters that have turned red by the confirmation now turn white. 
10 Numeric keys Use these keys to selecta window in each menu or make entries in each window. 
 
 
F1
START
STOP
CLEAR
ALARM
F2 F3 F4 F5 F6 F7
1 2 3
4 5 6
7 8 9
0 . -
ALT
ESC
SAVE ENTER
SH IFT
DELETE
TAB
MYPRO-CPⅣ
1 
2 
3 
5 
4 
6 
8 
7 
9 
11
12
13
10
QT108300 
 
- 14 - 
 
Keys on Front Panel (continued) 
No. Key Function 
11 START key Used to start the compressor only when the LOCAL mode (operation control mode) is 
selected. 
This key does not work in the REMOTE, COMM, or AUTO STAGE mode (see Section 
6.1). 
12 STOP key This key can be used to stop the compressor regardless of the operation mode selected 
(see CAUTION below). 
13 CLEAR ALARM key Use this key to clear an alarm if the compressor has stopped by issuance of an alarm 
(FAILURE). 
 
 
 
 
 
According to the selection for the ‘OPERATION’ item in the ‘OPERATION MODE’ 
window, the following conditions automatically take place when the STOP key is 
pressed on the front panel of PC4. 
 
- When the ‘LOCAL’, ‘REMOTE’, or ‘COMM’ mode (not the ‘AUTO STAGE’ mode) has 
been selected, pressing the STOP key causes no change to the operation control 
mode in the case of the ‘LOCAL’ mode, but the mode automatically changes to 
‘LOCAL’ in the case of the ‘REMOTE’ and ‘COMM’ modes. The compressor, if 
operating, will then stop after the liquid recovering sequence. (It remains stopped 
thereafter.) 
To restart the compressor, simply press the START key if you need not change the 
mode from ‘LOCAL’ to another, or turn ON the relevant operation control command 
after changing the mode from ‘LOCAL’ to the desired mode. 
 
- When the ‘AUTO STAGE’ mode has been selected, pressing the STOP key does not 
cause any change to the setting for the ‘OPERATION’ item in the ‘OPERATION 
MODE’ window, but the selection of ‘ENABLE’ you made for the ‘CONTROL’ item in 
the ‘AUTO STAGE’ window automatically changes to ‘DISABLE’. 
In this case, if the compressor under control is running when the STOP key is 
pressed, the compressor will then stop after completing the liquid recovering 
sequence. 
Even the STOP key is pressed on the master station and its ‘CONTROL’ item 
setting in the ‘AUTO STAGE’ window is consequently changed to ‘DISABLE’, the 
automatic staging control continues to work on all the other stations (slave 
stations). 
To recover the ‘AUTO STAGE’ mode control after pressing the ‘STOP’ key, it is 
necessary (for the case of the master station and the case of a slave station) to 
perform the steps below. (Simply pressing the START key on the station does not 
recover the automatic staging control.) 
 
1. From the ‘SETPOINTS’ menu (F1), open the ‘AUTO STAGE’ window. 
2. Select ‘ENABLE’ for the ‘CONTROL’ item in the window. 
 
 
QT108300 
 
- 15 - 
2.2 Parts on CPU Board (REF-CX100-PR01) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The above figure shows the CPU board used in CP4 and the locations of the circuit boards, switches, connectors, and other parts 
on it. These parts are explained in the following table. 
 
Parts on CPU Boards 
No. Parts Function 
1 Analog input board 
connector 
Used to connect the two different analog input boards to the CPU board. 
 (Use cable “REF-CX100-C1201-U” for connection.) 
2 LCD board connector Used to connect the LCD interface board to the CPU board. 
 (Use cable “REF-CX100-C0901-U” for connection.) 
3 ROM board connector Used to connect the ROM board to the CPU board. 
4 DC (5V) board connector Used to supply 5 V DC from the CPU circuit power supply to the CPU board. 
 (Use cable “REF-CX100-C0312-U” for connection.) 
5 Extension communication 
board connector 
Used to connect an extension communication board (option) to the CPU board. 
6 Digital input/output drive 
connector 
Used to connect digital input/output drive boards. The connectors are provided on the 
CPU board and can accommodate a maximum of four digital input/output drive boards (16 
inputs/outputs). The #1 connector is for switch inputs/outputs 1 to 4, #2 for digital 
inputs/outputs 5 to 8, #3 for switch inputs/outputs 9 to 12, and #4 for switch inputs/outputs 
13 to 16. 
7 KP board connector Used to connect the KP board to the CPU board. 
 (Use cable “REF-CX100-C1000-U” for connection.) 
8 Communication power 
connector 
Used to supply power from the CPU board power supply to an extension communication 
board (option). 
 (Use cable “REF-CX100-C0100-U” for connection.) 
9 DB board connector Used to connect a digital input/output driver base (DB) board (option) to the CPU board.
10 DB board power 
connector 
Used to supply power from the CPU board power supply to the connected DB board 
(option). 
 (Use cable “REF-CX100-C0100-U” for connection.) 
11 DC (12V) connector Used to supply 12 V DC from the power supply of the analog/digital and digital input/output 
circuits to the CPU board. 
 (Use cable “REF-CX100-C0322-U” for connection.) 
12 Digital input/output board 
connector 
Used to connect the digital input/output board to the CPU board with a cable. 
 (Use cable “REF-CX100-C1301-U” for connection.) 
1
14
2 
3 
4 
5 
6
7 
8 
9
10
11
12
13 
15
16
17
19
18
20
21
23 
24 
25 
26 
22 
QT108300 
 
- 16 - 
 
Parts on CPU Boards (continued) 
No. Parts Function 
13 Analog output board 
connector 
Used to connect an analog output board (option) to the CPU board. 
14 Extension AD board 
connector 
Used to connect an extension AD converter board (option) to the CPU board. 
15 Analog/digital board 
power connector 
Used to supply power from the CPU board to an extension analog/digital board (option).
 (Use cable “REF-CX100-C0100-U” for connection.) 
16 Battery holder Used to hold the memory backup battery (lithium primary cell CR2032). 
17 Reset switch Used to reset CP4 system. 
 
 
 
 
 
 
Operate the reset switch carefully. 
 
 
 
18 CPU lamp Blinks red at regular intervals while the CPU is running normally. 
19 DIP switch The top switch is numbered “1” and the bottom one is numbered “8”. Slide each switch to 
the right to set it to ON. 
 
 
 
 
 
 
Slide each switch until it clicks. 
 
 
 
20 Input selector switch for 
CH 15 and CH 16 
Used to switch between terminal blocks 15A and 15B for analog input CH15 and between 
16A and 16B for analog input CH16.(15B and 16B are selected by default.) 
Moving the switch to the right selects terminal block 15A/16A, and moving it to the left 
selects terminal block 15B/16B. 
 
 
 
 
 
 
Move the switch until it clicks. 
 
 
 
21 Heat sink 
 
 
 
 
 
The heat sink is hot. Do not touch it by hand. 
 
 
 
22 COM 0 operation lamp Lights green during transmission; lights red during reception. 
23 COM 1 terminal block Provides terminals for 4-wire RS-485 communication ports. 
 
QT108300 
 
- 17 - 
 
Parts on CPU Boards (continued) 
No. Parts Function 
24 COM 1 terminating 
resistor switches 
These switches turn ON/OFF the terminating resistors in the CPU board. 
They provides termination for the transmission and receiving lines independently. Move 
the switch up to turn ON the terminating resister. 
 
 
 
 
 
 
Move the switch until it clicks. 
 
 
 
25 COM 1 operation lamp Lights green during transmission; lights red during reception. 
26 COM 0 connector Provides RS-232C Communication Ports. For setting for the ports, see Section 5.8 
Adjustments in ‘COMMUNICATION SETUP’ Window (Option 8 of ‘ADJUSTMENT’ Menu 
(F5)). 
 
2.2.1 Reset Switch on CPU Board 
CP4 requires system resetting if the stored setting data is lost or before newly setting up the system. 
There are the following two methods for the system resetting. 
• Hardware resetting method 
• Software resetting method 
 
This section explains the hardware method. (For the software method, see Section 3.4 Software Resetting Method.) 
 
 
 
 
 
 
 
 
 
 
The reset switch is in the location encircled in the above figure. 
Press and release the switch to reset CP4. CP4 will be rebooted (but the systemis not set up by simply pressing this switch). 
 
The system can also be reset by turning OFF and then ON the CP4 power supply. 
 
 
 
 
Resetting CP4 brings the controller in a momentary instable condition, following 
which CP4 is placed in a condition that would result just after turning power ON. As 
this condition is detrimental to the compressor unit if it occurs during operation, 
never perform system resetting while the compressor and accessory is in operation. 
 
 
 
QT108300 
 
- 18 - 
2.2.2 Replacement of Memory Backup Battery on CPU Board 
 
CP4 uses a primary cell as a power source to retain the setting data and keep driving the internal clock in the event of a power 
failure. The battery can supply power enough to back up the memory of setting data for about three years. The battery starts 
running down immediately after it is produced even if it is not used. 
If power failure occurs when the battery is completely discharged, all data including the setting and log data will be lost and the 
internal clock will be reset to zero. 
 
NOTE: 
The battery life may be shorter than three years in high-temperature or other unfavorable environments. 
 
To prevent this kind of problem, CP4 has a low battery detection function. If a low battery condition is detected, this function 
causes the “BATTERY ALARM” message to blink at the center of the top line in both status display screens (see Section 3.1 
Display Screens). 
 
 
 
 
If the “BATTERY ALARM” message is blinking, replace the battery immediately. 
If the CPU is reset following such an operation as turning on the power supply with 
the internal battery discharged, PC4 will automatically be restarted by “special 
booting” for the sake of safety. Once this has occurred, the compressor cannot be 
operated any further unless the memory backup battery is replaced with a battery of 
the normal voltage (see Section 3.5 Special Booting). 
 
 
The memory backup battery can be replaced regardless of whether the system is under power or not. The setting data are not 
lost as long as the battery is replaced while the system is under power. However, if the battery is replaced while power is out, all 
stored setting data are lost and the internal clock is initialized. 
 
Use the following method to replace the internal battery. 
 
 
 
 
Do this operation carefully not to let the battery touch any of the nearby components. 
 
 
(1) Insert your fingernail into the part indicated by the arrow and, while holding the old battery by its top and bottom, disengage 
only the clip on the left side of the holder. Now the battery is free for removal. 
Be sure to hold the battery; otherwise, it will drop from the board when the clip is released. 
 
 
(The right figure shows the holder after 
removal of the battery.) 
 
 
 
 
 
QT108300 
 
- 19 - 
 
(2) While holding a new battery by its top and bottom, engage the battery with the clip (indicated by the arrow) at the right part 
in the holder. 
 
(The right figure shows the battery 
engaged with the clips. You should still 
keep holding the battery as it can drop 
out of the board if it is released.) 
 
 
(3) Set the battery into its horizontal position in the holder. 
(4) Lightly press the part indicated by the arrow to fit the battery snugly into position in the holder. 
 
 
 
 
 
 
 
 
2.3 EPROM Board (REF-CX100-RM01) 
 
The EPROM board to be installed on the CPU board has the following connector and sockets. 
 
 
 
 
 
 
 
 
 
 
 
NOTE: 
The 32-megabit EPROM (software-written circuit board) is installed on the standard version. (The 40-pin socket for 4-megabit 
ROM is not used.) 
 
Parts on EPROM Board 
No. Parts Function 
1 ROM board connector Used to connect the ROM board to the CPU board. The connector is provided on the back 
of the CPU board. 
2 40-pin socket for 
4-megabit ROM 
This socket is for mounting a programmable ROM circuit board. Mount the ROM board 
with the recess facing up. 
A ROM equivalent to 27C4002 (4 megabits) is connectable to this socket. (The use of an 
ST Micro M27C4002-12F1 is recommended.) 
 
 
 
 
 
 
Mount/demount the ROM board carefully. 
 
 
 
1
2 
3 
QT108300 
 
- 20 - 
 
Parts on EPROM Board (continued) 
No. Parts Function 
3 42-pin socket for 
32-megabit EPROM 
This socket is for mounting a programmable ROM circuit board. Mount the ROM board 
with the recess facing up. 
An EPROM equivalent to 27C322 (32 megabits) is connectable to this socket. (The use of 
an ST Micro M27C322-100F1 is recommended.) 
 
 
 
 
 
 
Mount/demount the ROM board carefully. 
 
 
 
 
2.3.1 Replacement of EPROM on CPU Board 
Follow the procedure below when replacing (updating) the EPROM (software-written circuit). 
 
(1) Take a note of the settings and other data. (This step may be not necessary depending on the type of the EPROM to be 
replaced.) 
(2) Turn off the power supply of CP4. 
(3) Check that the CPU lamp on the CPU board is OFF. (This is necessary to make sure the power supply has been turned 
off.) 
(4) Using an EPROM extractor, remove the EPROM carefully from the ROM board. 
 
 
 
 
Do not pry the EPROM using a flat head screwdriver or a similar tool; this may damage 
the ROM board. 
 
 
(5) Connect a new EPROM to the IC socket on the left side (as viewed from the front), with the recess facing upward (see the 
figure below). 
 
 
 
 
Incorrect connection can cause an operational failure. 
 
 
(6) Reconfirm that the EPROM is installed correctly. 
QT108300 
 
- 21 - 
 
(7) Turn on the power supply of CP4. (According to the condition, CP4 may need to be initialized.) 
 
 
 
 
 
 
 
 
 
 
 
 
 
2.4 Analog Input Boards (REF-CX100-AI01, REF-CX100-AI11) 
The analog input boards for installation on the CPU board have the following terminal blocks and connectors. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Parts on Analog Input Boards 
No. Name Function 
1 Analog input board 
connector 
The connector on each analog input board is used to connect it to the CPU board. The
connector is a 20-pin connector for both analog input boards. 
 (Use cable “REF-CX100-C1201-U” for connection.) 
2 24 V DC connectors Used to connect 24 V DC from the analog input/output circuit power supply to the analog 
input board. 
(Use cable “REF-CX100-C0401-U” for connection; use cable “REF-CX100-C0501-U” for 
connection between the AI01 and AI11 boards.) 
 
4 (CH1 to CH3) 
4 (CH4 to CH6) 
4 (CH7 to CH9) 
3
1 
2 
2 
4 (CH16A - CH16B)
4 (CH13 - CH15A)
4 (CH10 - CH12)
3
1
2
2
Insert the EPROM while aligning its recess with the recess in the IC socket. 
 M
Y
P
R
O
-C
P
IV
 
 V
er.A
.B
C
 
N
ot used 
QT108300 
 
- 22 - 
 
Parts on Analog Input Boards (continued) 
No. Name Function 
3 Current/voltage selector 
switches (JP1 to 9 and JP1 
to 7) for analog inputs 
Each of these switches selects either voltage or current for analog inputs. 
Set each switch to ON for current input or OFF for voltage input. (All of these switches are 
defaulted to OFF.) 
 
 
 
 
Move the switch to each position until it clicks. 
 
 
 
4 Analog input terminal 
blocks 
Used to connect analog input wires. Each terminal block can supply sensors with power 
(although the power level is limited). 
Either current/voltage input or potentiometer input is selectable for CH15 and CH16. 
CH15A and CH16A are assigned to current/voltage inputs. CH15B is assigned to low-stage 
potentiometer inputs, and CH16B is assigned to high-stage potentiometer inputs. 
To use CH15 and CH16, connect desired input lines to the corresponding terminal blocks
and then set the current/voltage selector switches for on the CPU board CH 15 and CH 16
as appropriate (see Section 2.2). 
 
NOTE: 
Use also the above analog input boards when adding analog input channels (AD CH17 to CH32). 
 
2.4.1 Current / Voltage Selection and Terminal BlockConnections for Analog Input 
Boards 
Set switches JP1 to JP9 (for CH1 to CH9) and switches JP1 to JP7 (for CH10 to CH14, CH15A, and CH16A) on the associated 
analog input boards to ON when the analog input sources provide current signals. Set these switches to OFF for voltage signal 
inputs. 
 
The analog input circuits (internal circuit of CP4) are schematically shown below. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
When the current/voltage selector switch is set to ON, a 250-ohm resistor is connected to the input circuit as shown in the above 
diagram. DC current signals of 4 to 20 mA are then converted into 1 to 5 V DC voltage signals before being input to the 
analog-to-digital (A/D) converter circuit. When the selector switch is set to OFF, the current signals are input directly to the A/D 
converter circuit. 
Make connections on each terminal block as follows: 
Analog input boards 
To A/D converter circuit 
AG
FG
24V
250Ω
1 24V 
2 1+ 
3 1- 
4 FG
Input 
filter 
circuit 
Current/voltage 
selector switch 
Internal circuits of CP4 
QT108300 
 
- 23 - 
 
- Current signal sources using CP4’s power supply: 
Connect “+” side of the input source to the 24V terminal of the terminal block and the “-” side to an appropriate one of the “+” 
terminals 1 to 16 on the terminal block. 
- Current signal sources using an outside power supply: 
Connect the “+” side of the input source to an appropriate one of the “+” terminals 1 to 16 on the terminal block and the “-” side 
to an appropriate one of the “-” terminals 1 to 16 on the terminal block. 
- Voltage signal sources: 
Connect the “+” side of the input source to an appropriate one of the “+” terminals 1 to 16 on the terminal block and the “-” side 
to an appropriate one of the “-” terminals 1 to 16 on the terminal block. 
 
 
 
 
Move the switch until it clicks. 
 
 
NOTE: 
The switch is set to OFF before shipment from the factory. 
 
2.4.2 Input Type Selection for Channels 15 and 16 of Analog Input Boards 
Like with the Mayekawa’s controller MYPRO-CPIII, CP4 has a means for setting the analog input channels 15 and 16 (CH15 and 
CH16) for receiving current/voltage inputs or potentiometer inputs. 
When the lever of the analog input selector switch marked “JP3” on the CPU board is moved to the “15A” side, Channel 15 is set 
for receiving current/voltage inputs (analog input terminal block CH15A is enabled). When the lever is moved to the 15B side, 
Channel 15 is set for receiving potentiometer inputs (analog input terminal block CH15B is enabled). 
The same applies to Channel 16 although the switch number and terminal board designations are different accordingly (see 
NOTE under the table below). 
 
The diagram below shows the analog-to-digital (A/D) converter circuit (internal circuit of CP4) to schematically depict the above 
explanation taking Channel 15 for example. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 CPU board 
Current/voltage 
inputs 
CH15A 
from analog input 
board 
15BPotentiometer 
converter circuit
Analog-to-
digital 
converter 
circuit 
Analog input 
selector switch 
JP3 
Potentiometer 
inputs 
CH15B 
from analog input
board 
15A
QT108300 
 
- 24 - 
 
Selection of Input Source Type for Channel 15 
(in the case of position inputs for low-stage unloader slide valve) 
Input Source Connection 
JP6 switch 
position on analog 
input board 
JP3 switch position 
on CPU board 
Potentiometer Potentiometer inputs 1 to 3 are connected to 
terminals LF1 to LF3 of terminal block 
CH15B on analog input board. 
Any position 15B 
Current input source 
with power supplied 
from CP4 
Connect “+” side to terminal 24V on CH15A 
terminal block of analog input board, and “-” 
side to terminal15A+. 
ON 15A 
Current input source 
with power supplied 
from outside 
Connect “+” side of input to terminal 15A+ on 
CH15A terminal block of analog input board, 
and “-” side to terminal 15A-. 
ON 15A 
Voltage input source Connect “+” side of input to terminal 15A+ on 
CH15A terminal block of analog input board, 
and “-” side to terminal 15A-. 
OFF 15A 
 
NOTE: 
The above table also applies to selection of analog input type for channel 16 if channel number “15” is read as “16”, switch 
number “JP6” of the AI board as “JP7”, and switch number “JP3” of CPU board as “JP4”. 
 
 
 
 
Move the switch lever until it clicks. 
 
 
2.5 Optional Analog Output Board (REF-CX100-DA01) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Parts on Analog Output Board 
No. Name Function 
1 Analog output board 
connector 
Used to connect this analog output board to the CPU board. The CPU board’s connector is 
located on its back. 
2 24 V DC connector Used to supply 24 V DC from the analog input/output circuit power supply to this analog 
output board. 
(Use cable “REF-CX100-C0322-U” for connection.) 
3 Trimming data memory The trimming data (output adjustment data) for the analog section of the analog output
circuit is written in a non-volatile memory. As each analog output board has this data 
memory, re-trimming is not necessary even if an analog output board is added or replaced.
4 Analog output terminal 
block 
Used to connect wires for analog outputs (4 to 20 mA DC). 
 
2
1 
3 
4 
QT108300 
 
- 25 - 
2.6 Optional Digital Input/Output Drive Base (DB) Board (REF-CX100-DB01) 
 
 
 
 
 
 
 
 
 
 
 
 
Parts on Optional Digital Input/Output DB Board 
No. Name Function 
1 DB board connector Used to connect this DB board to the CPU board. 
2 12 V DC connector Used to supply 12 V DC from AD digital input/output circuit power supply via the CPU 
board. 
(Use cable “REF-CX100-C0100-U” for connection.) 
3 DIO driver connectors Used to connect digital input/output driver (DIOD) boards. Connectors for four DIOD boards 
(16 terminals) are provided on this DB board. 
The #1 connector corresponds to I/O terminals 17 to 20, the #2 connector corresponds to 
I/O terminals 21 to 24, and so on. 
DIOD boards for connection to the connectors are as follows: 
 #1 : REF-MCS200-SO* (4 outputs) 
 #2 : REF-MCS200-SO* (4 outputs) 
 #3 : REF-MCS200-SO* (4 outputs) 
 #4 : REF-MCS200-SC2* (2 outputs and 2 inputs) 
 (* indicates a revision number.) 
4 Rotary switch Used to set the ID (station number) of the DB board. 
 
 
 
 
Do not move the switch from position 1. 
 
 
 
5 Digital input/output board 
connector 
Used to connect a digital input/output board and DB board with a cable. 
Digital input/output boards and cables used are the same as those for the CPU board. 
 (Use cable “REF-CX100-C1301-U” for connection.) 
6 Reserved Currently not used 
 
2
5
3 
1 
4 
6 
QT108300 
 
- 26 - 
2.7 Digital Input/Output Board (REF-MCS200-OIA0, REF-MCS200-OIE0 (Optional)) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Parts on Digital Input/Output Board 
No. Name Function 
1 Digital input/output board 
connector 
Used to connect an optional DB board to the CPU board or to a digital input/output board 
using a cable. 
 (Use cable “REF-CX100-C1301-U” for connection.) 
2 Digital input/output terminal 
block 
Used to connect digital input/output wires. 
Terminals 1A and 1B correspond to digital input/output CH 1; terminals 16A and 16B 
correspond to digital input/output CH 16. 
3 Digital input/output lamp Indicates whether digital input/output is ON or OFF (goes on when input/output is ON and 
goes off when input/output is OFF). LED 1 corresponds to digital input/output CH1; LED 16 
corresponds to digital input/output CH16. 
4 Digital output circuit On the REF-MCS200-0IA0 board, digital input/output channels CH1 to CH10 are assigned 
to digital outputs. On the REF-MCS200-0IE0 board (option), digital input/output channels
CH1 to CH14 are assigned to digital outputs (switch outputs). 
5 Digital input circuit On the REF-MCS200-0IA0 board, digital input/output channels CH11 to CH16 are 
assigned to digital inputs. On the REF-MCS200-0IE0 board(option), digital input/output 
channels CH15 and CH16 are assigned to digital inputs. 
6 Relay sockets These relay sockets provided for digital outputs allow the use of mechanical relays or solid 
state relays. 
7 Relay The following relays are usable. 
Mechanical relay: OMRON G6B-1114P-US, 12 V DC (rated output load: 5A at 250 V AC/30 
V DC) 
Solid state relay: G3S-201PL-PD-US, 12 V DC (rated output load: 1.2 A at 100 to 240 V
AC) 
8 TNR (ceramic variable 
resistor) 
Provided to protect contacts of the relays. 
9 Circuit protector Provided to protect the relays from overcurrent. Output is interrupted if current exceeding 1 
A flows through relay contacts. Remove the overcurrent condition first and then push in the 
white knob of the circuit protector to recover relay outputs. 
 
1 
3 
6, 7 
4 
5 
8 
9 
2 
10 
REF-MCS200-OIA0 
REF-MCS200-OIE0 (optional) 4 
5 
QT108300 
 
- 27 - 
 
Parts on Digital Input/Output Board (continued) 
No. Name Function 
10 Frame ground (FG) 
terminal 
Provided to keep continuity between ground (terminal) and the printed circuit board. 
 
 
 
 
Securely connect the FG terminal to ground (terminal); otherwise, the 
digital input/output board does not work normally. 
 
 
 
 
NOTE: 
This digital input/output board is not installed on the back surface of the MYPRO-CPIV Control Panel. 
 
2.8 Optional Communication Board (REF-CX100-RS01) 
 
 
 
 
 
 
 
 
 
 
 
 
 
Parts on Optical Communication Board 
No. Name Function 
1 Extension Communication 
board connector 
Used to connect this optional extension communication board to the CPU board. 
2 COM2 and COM3 lamps Left lamp is for COM2 port and right lamp is for COM3 port. Each lamp lights green during 
transmission and lights red during reception. 
3 Communication power 
supply connector 
Used to supply power from CPU board power supply to this extension communication 
board. 
 (Use cable “REF-CX100-C0100-U” for connection.) 
4 COM2 terminal block Terminal block for 4-wire RS-485 communication ports 
5 COM2 terminating switch Used to terminate the transmission and receiving line independently. Moving the switch up 
terminates the line. 
 
 
 
 
Move the switch until it clicks. 
 
 
 
6 COM3 terminal block Terminal block for 4-wire RS-485 communication ports 
 
1 
2
3
5 
7 
6 
4 
QT108300 
 
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Parts on Optical Communication Board (continued) 
No. Name Function 
7 COM3 terminating switch Used to terminate transmission and receiving lines independently. Moving the switch up 
terminates the line. 
 
 
 
 
Move the switch until it clicks. 
 
 
 
 
2.9 Optional Analog-to-Digital (AD) Converter Board (REF-CX100-AD01) 
 
 
 
 
 
 
 
 
 
 
 
 
Parts on Optical AD Converter Board 
No. Name Function 
1 Extension AD converter 
board connector 
Used to connect this extension AD converter board to the CPU board. 
2 Analog input board 
connector 
Used to connect the two types of analog input board and the AD converter board like with
the CPU board. 
(Use cable “REF-CX100-C1201-U” for connection.) 
3 Input selector switch for 
CH15 and CH16 
This switch is used to switch analog input between 15A and 15B terminal boards and 
between 16A and 16B terminal boards. Moving the switch to the right selects 15A or 16A;
moving it to the left selects 15B or 16B. 
 
 
 
 
Move the switch until it clicks. 
 
 
 
4 AD board power supply 
connector 
Used to supply power from the CPU board to this AD converter board. 
(Use cable “REF-CX100-C0100-U” for connection.) 
 
2 
3 
1 
4 
QT108300 
 
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Chapter 3 Operation 
 
3.1 Display Screens 
CP4 has two types of status display screen: the “Main Graphic Screen” and “Main Status Screen”. You can swap these screens 
by pressing the TAB key while no function menu and windows are displayed. 
 
3.1.1 Acronyms and Abbreviations Used for Indicated Items 
In these two screens, the indicated items are represented using the acronyms and abbreviations shown in the following tables. 
The tables also show the channel numbers for analog and digital inputs and outputs. For digital input/output channel numbers, 
their aliases are also shown. 
 
Real analog inputs 
Acronym Full Spelling Input Channel No. 
SP SUCTION PRESSURE AI 1 
DP DISCHARGE PRESSURE AI 2 
OP OIL SUPPLY PRESSURE AI 3 
AFP AFTER FILTER PRESSURE AI 4 
ST SUCTION TEMPERATURE AI 5 
DT DISCHARGE TEMPERATURE AI 6 
OT OIL SUPPLY TEMPERATURE AI 7 
OS OIL SEPARETER TEMPERATURE AI 8 
AFFP AFTER FINE FILTER PRESSURE AI 8 
IP IMTERMEDIATE PRESSURE AI 9 
IT INTERMEDIATE TEMPERTURE AI10 
SDP SYSTEM DISCHARGE PRESSURE AI11 
LVL LIQUID LEVEL AI11 
MA MOTOR ELECTRIC CURRENT AI12 
EBT ENTERING BRINE TEMPERATURE AI13 
LBT LEAVING BRINE TEMPERATURE AI14 
LSV (LOW STAGE) SLIDE VALVE POSITION AI15 
HSV HIGH STAGE SLIDE VALVE POSITION AI16 
SSP SYTEM SUCTION PRESURE AI16 or AI19 
SVOP SLIDE VALVE OIL SUPPLY PRESSURE AI16 
PSV Vi PORT SLIDE VALVE POSITION AI16 
SP1 SUCTION PRESSURE1 AI17 
GT1 CHILLER GAS TEMPERATURE1 AI18 
RLD REMOTE CAPACITY CONTROL TARGET AI20 
SP2 SUCTION PRESSURE2 AI25 
GT2 CHILLER GAS TEMPERATURE2 AI26 
OPT1 OPTION ANALOG INPUT 1/4 AI8, AI9, AI10, AI11, AI13, AI14, AI21, AI22, AI23 or AI24 
OPT2 OPTION ANALOG INPUT 2/4 AI8, AI9, AI10, AI11, AI13, AI14, AI21, AI22, AI23 or AI24 
OPT3 OPTION ANALOG INPUT 2/4 AI8, AI9, AI10, AI11, AI13, AI14, AI21, AI22, AI23 or AI24 
OPT4 OPTION ANALOG INPUT 4/4 AI8, AI9, AI10, AI11, AI13, AI14, AI21, AI22, AI23 or AI24 
 
QT108300 
 
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Virtual analog inputs (derived from real analog inputs through calculation) 
Acronym Full Spelling Assigned Input Channel No. 
⊿OP OIL DIFFERENTIAL PRESSURE AI65 
⊿FP FILTER DIFFERENTIAL PRESSURE AI66 
⊿P DIFFERENTIAL PRESSURE AI67 
SSH SUCTION SUPERHEAT AI68 
ISH INTERMEDIATE SUPERHEAT AI69 
DSH DISCHARGE SUPERHEAT AI70 
D/S DISCHARGE/SUCTION PRESSURE RATIO AI71 
Vi CALCULATED Vi AI72 
CRVi CURRENT Vi AI73 
CAP COMPRESSOR CAPACITY AI74 
SVP SLIDE VALVE PERCENTAGE AI75 
ATP AUTO STAGE TARGET PRESSURE AI76 
⊿OP2 OIL DIFFERENTIAL PRESSURE2 AI77 
SH2 SUCTION SUPERHEAT2 AI78 
⊿FFP FINE FILTER DIFFERENTIAL PRESSURE AI79 
N.C. NOT CONNECTED 
 
Digital inputs/outputs 
Acronym Full Spelling Input/Output Cannel No. Alias 
COMP COMPRESSOR DO1 Y 0 
OILP OILPUMP DO2 or DO20 Y 1 or Y13
I/CS LIQUID SUPPLY SOLENOID VALVE for 
ECONOMIZER/INTERCOOLER 
DO2 or DO8 Y 1 or Y 7 
LOAD (LOW STAGE) LOADING SOLENOID VALVE DO3 Y 2 
UNLD (LOW STAGE) UNLOADING SOLENOID VALVE DO4 Y 3 
HILD HIGH STAGE LOADING SOLENOID VALVE DO5 Y 4 
INJS LIQUID SUPPLY SOLENOID VALVE for LIQUID 
INJECTION 
DO5 Y 4 
HIUL HIGH STAGE UNLOADING SOLENOID VALVE DO6 Y 5 
INJY YOSAKU EXPANSION VALVE for LIQUID 
INJECTION 
DO6 Y 5 
OILH OIL HEATER DO7 Y 6 
EVPS LIQUID SUPPLY SOLENOID VALVE for CHILLER DO7 or DO17 Y 6 or Y10
ViBP BYPASS SOLENOID VALVE for Vi PORT DO7 Y 6 
ViLD LOADING SOLENOID VALVE for Vi PORT DO8 Y 7 
OILD OIL DRAIN SOLENOID VALVE DO9 Y 8 
OILF OIL FEED SOLENOID VALVE DO9 Y 8 
OILR OIL RETURN SOLENOID VALVE DO9 Y 8 
ViUL UNLOADING SOLENOID VALVE for Vi PORT DO9 Y 8 
FAIL FAILURE DO10 Y 9 
EMGC EMERGENCY STOP DI11 X A 
MSRB MAIN STARTER READ BACK DI12 X B 
ITL1 INTERLOCK-1 DI13 X C 
ITL2 INTERLOCK-2 DI14 X D 
ITL3 INTERLOCK-3 DI15 X E 
RMST REMOTE START INPUT DI16 X F 
MPLD LOADING SOLENOID VALVE for PORT-M DO17 or DO26 Y10 or Y19
EVPY YOSAKU EXPANSION VALVE for CHILLER DO18 Y11 
MPUL UNLOADING SOLENOID VALVE for PORT-M DO18 or DO27 Y11 or Y1A
CHLP CHILLER PUMP DO19 Y12 
SVBP BYPASS SOLENOID VALVE for Vi SLIDE VALVE DO19 Y12 
SBYP BYPASS SOLENOID VALVE for STARTING DO20 or DO28 Y13 or Y1B
HBYP BYPASS SOLENOID VALVE for HOT GAS DO20 Y13 
I/CY YOSAKU EXPANSION VALVE for 
ECONOMIZER/INTERCOOLER 
DO21 Y14 
O/P2 OIL PUMP2 DO21 Y14 
ALRM ALARM DO22 Y15 
EVS2 LIQUID SUPPLY SOLENOID VALVE2 for CHILLER DO23 Y16 
LHLD LOADING SOLENOID VALVE for PORT-L/H DO23 or DO29 Y16 or Y1C
EVY2 YOSAKU EXPANSION VALVE2 for CHILLER DO24 Y17 
LHUL UNLOADING SOLENOID VALVEfor PORT-L/H DO24 or DO30 Y17 or Y1D
CND1 OUTPUT1 for CONDENSER(VFD) DO25 Y18 
AUX AUXILIARY DO25 Y18 
QT108300 
 
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Digital inputs/outputs (continued) 
Acronym Full Spelling Input/Output Cannel No. Alias 
CND2 OUTPUT2 for CONDENSER DO26 Y19 
CND3 OUTPUT3 for CONDENSER DO27 Y1A 
CND4 OUTPUT4 for CONDENSER DO28 Y1B 
IJY2 YOSAKU EXPANSION VALVE2 for LIQUID 
INJECTION 
DO28 Y1B 
CND5 OUTPUT5 for CONDENSER DO29 Y1C 
EVS3 LIQUID SUPPLY SOLENOID VALVE3 for CHILLER DO29 Y1C 
CND6 OUTPUT6 for CONDENSER DO30 Y1D 
EVY3 YOSAKU EXPANSION VALVE3 for CHILLER DO30 Y1D 
RMLD REMOTE LOAD INPUT DI31 X1E 
RMUL REMOTE UNLOAD INPUT DI32 X1F 
 
PID controller 
Acronym Full Spelling 
LSV P (LOW STAGE) SLIDE VALVE on PRESSURE 
LSV T (LOW STAGE) SLIDE VALVE on CHILLER LEAVING BRINE TEMPERATURE 
SCTSH CHILLER EXPANSION VALVE on SUCTION SUPERHEAT 
SPLMT LIMIT on SUCTION PRESSURE for CHILLER EXPANSIN VALVE 
LBLMT LIMIT on CHILLER LEAVING BRINE TEMPERATURE for CHILLER EXPANSIN VALVE 
INTSH ECONOMIZER/INTERCOOLER EXPANSION VALVE on INTERMEDIATE SUPERHEAT 
INJCT LIQUID INJECTION 
LVGBT FLOW CONTROL VALVE on CHILLER LEAVING BRINE TEMPERATURE 
CNDNS VFD CONDENSER FAN 
HI SV HIGH STAGE SLIDE VALVE on INTERMEDIATE PRESSURE 
VFD P VFD COMPRESSOR on PRESSURE 
VFD T VFD COMPRESSOR on CHILLER LEAVING BRINE TEMPERATURE 
SCSH2 CHILLER EXPANSION VALVE2 on SUCTION SUPERHEAT2 
SP2LM LIMIT on SUCTION PRESSURE2 for CHILLER EXPANSIN VALVE2 
LEVEL LEVEL 
SV SET VALUE 
MV MANIPULATION VALUE 
 
Others 
Acronym Full Spelling 
A/O, AO ANALOG OUTPUT 
AI ANALOG INPUT 
C7 CHARACTER BIT 7 
C8 CHARACTER BIT 8 
CH. CHANNEL 
COM, 
COMM 
COMMUNICATION 
COMP. COMPRESSOR 
CTRL CONTROL 
D/O DIGITAL OUTPUT 
ECONO. ECONOMIZER/INTER COOLER 
EXP.VALVE EXPANSION VALVE 
H.SLIDE 
VALVE 
HIGH STAGE SLIDE VALVE 
HI HIGH 
HRS HOURS 
HSV HIGH STAGE SLIDE VALVE POSITION 
I/O INPUT/OUTPUT 
INTER INTERMEDIATE 
L.SLIDE 
VALVE 
LOW STAGE SLIDE VALVE 
LB CHILLER LEAVING BRINE TEMPERATURE 
LO LOW 
MV MANIPURATING VALUE 
MVH MANIPULATING VALUE HIGH LIMIT 
MVL MANIPULATING VALUE LOW LIMIT 
OIL P. OIL PUMP 
P. PAGE 
QT108300 
 
- 32 - 
 
Others (continued) 
Acronym Full Spelling 
PE EVEN PARITY 
PN NON PARITY 
PO ODD PARITY 
PRES. PRESSURE 
PRESS. PRESSURE 
S1 STOP BIT 1 
S2 STOP BIT 2 
SETPT SET POINT 
SH SUPERHEAT 
SP SUCTION PRESSURE 
SV SLIDE VALVE POSITION or SOLENOID VALVE 
TEMP TEMPERATURE 
VFD VARIABLE FREQUNCY DRIVE 
W/ WITH 
W/O WITHOUT 
 
3.1.2 Main Graphic Screen 
The “Main Graphic Screen” shows the compressor’s current status using graphics. Colors and symbols help you to check the 
compressor’s operating conditions and alarms. 
The Main Graphic Screen has priority over the “Main Status Screen”, the other compressor status screen. To select the Main 
Status Screen, press the TAB key when no function menu or window is displayed. 
 
 
 
Colors and symbols are used as follows: 
Refrigerating system and oil pump in operation: Displayed in green. 
Refrigerating system and oil pump not in operation: Displayed in gray. 
Refrigerating system automatically stopped: Displayed in red. 
In FAILURE (critical failure) condition: Indicated by a blinking symbol. 
In ALARM (non-critical failure) condition: Indicated by a blinking symbol. 
 
 
Title block
Warning display
Timer
ALARM/FAILURE 
 display 
Function menu 
 display 
DATE 
Status display
Low battery alarm 
QT108300 
 
- 33 - 
 
 
 
 
• If a low battery alarm “BATTERY ALARM” is displayed showing that the memory 
backup battery is discharged, replace the battery immediately (see Section 2.2.2 
Replacement of Memory Backup Battery on CPU Board). 
• If the CPU is reset following such an operation as turning on the power supply 
with the internal battery discharged, PC4 will automatically be restarted by 
“special booting” for the sake of safety. Once this has occurred, the compressor 
cannot be operated any further unless the memory backup battery is replaced 
with a battery of the normal voltage (see Section 3.5 Special Booting). 
 
 
3.1.3 Main Status Screen 
The “Main Status Screen” shows the current status related to operation of the compressor unit using letters and numeric values. 
To change the display to the Main Graphics Screen, press the TAB key when no function menu or window is displayed. 
 
 
 
 
 
Display of Main Status Screen 
No. Name Function 
1 Title block Displays controller’s name. 
2 DATE Displays current date and time. Also indicates panel inside temperature. 
3 OPERATION MODE 
window 
Displays current operation control mode, compressor status, and operation start/stop 
settings. 
4 CAPACITY CONTROL 
window 
Displays current status of capacity control. 
This window also gives an indication if increase of the compressor’s capacity is prohibited
or it is forcedly reduced. 
5 MAIN STATUS 
window 
Displays current values of individual analog inputs, calculated values derived from analog 
inputs, total operating time count, and day’s operating time count. 
6 COMMUNICATION 
window 
Displays current communication status. 
 
1
3 
4
6
7
8
2 
5 
 9 
QT108300 
 
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Display of Main Status Screen (continued) 
No. Name Function 
7 ALARM/FAILURE 
display area 
Displays currently issued alarms. 
The alarms cannot be cleared unless the ALARM CLEAR key is pressed (certain alarms 
cannot be cleared by the ALARM CLEAR key.). 
This field is blank if no alarm is issued. 
(see Section 7.1 Settings in ‘ALARM/FAILURE’ Windows 1/3 to 3/3) 
8 Function display area Displays function menus corresponding to function keys (F1 to F7). 
(see Section 1.2 Menu-Window Organization (Menu Tree)) 
9 Low battery alarm Displays “BATTERY ALARM” warning when the memory backup battery is discharged. 
 
 
 
 
 
 
If the low battery alarm “BATTERY ALARM” is displayed, replace the 
memory backup battery immediately. 
 
 
 
 
‘OPERATION MODE’ window 
The ‘OPERATION MODE’ window indicates the current selections and states concerning the operation control mode and other 
items related to control of the compressor. 
 
 
 
Items of ‘OPERATION MODE’ Window 
Item Selection/State Description 
 NO ‘D/O TEST OPERATION’ is disabled (automatic operation is 
possible). 
D/O TEST OPERATION 
 (Manual operation (see 
Section 6.2)) YES ‘D/O TEST OPERATION’ is enabled (automatic operation is 
impossible). 
-ON LOCAL 
-OFF 
START and STOP keys on the front panel are used to start and stop 
the compressor. 
-ON REMOTE 
-OFF 
Compressor starts/stops according to the remote start/stop inputs at 
DI-16. 
-ON COMM 
-OFF 
Compressor starts/stops according to commands given by a remote 
device through communications. 
-ON 
MODE 
 (Operation control mode 
(see Section 6.1)) 
 STAGE 
-OFF 
Compressor starts/stops according to the “automatic staging” (‘AUTO 
STAGE’) control (option). (see Section 6.7) 
 NO Automatic start/stop control of the compressor according to the set 
values is disabled. 
 YES Automatic start/stop control of the compressor according to the set values is enabled. 
AUTO START/STOP 
 (Automatic operation 
(see Section 6.1)) 
 STG Automatic start/stop control according to the “automatic staging” 
(‘AUTO STAGE’) control (option) is enabled. 
 STOP Compressor is stopped. 
 ANTI CYCLE Compressor is in “anti-cycle” state. 
 AUTO STOP Compressor is automatically stopped. 
 CUT IN Operation sequence of compressor is started. 
 SYSTEM START System is being activated. 
 OIL PUMP START Oil pump is started. 
 START Compressor is being started. 
 RUN Compressor is running. 
 CUT OUT Stop control sequence is started. 
COMP STATE 
 (Compressor state) 
 PUMP OUT Liquid recovery is in progress. 
 
QT108300 
 
- 35 - 
 
Items of ‘OPERATION MODE’ Window (continued) 
Item Selection/State Description 
CUT IN 
 (Operation start 
pressure) 
Pressure or temperature 
Indicates current setting for the start (CUT IN) pressure/temperature. 
This item also indicates new setting resulting from switching/change