Bitzer CM-SW-01 User Manual

SG-150-1 27
10.2.2 Data values, scaling and data types
Following is a description of used scaling and data types.
Scale 1, 10 and 100 refers to where the decimal point is implied, as a decimal value cannot be transmitted
via Modbus.
Scale 1: The value is the exact value
Scale 10: To transmit a value it must be multiplied by 10; i.e. 12.3 -> 123
A received value must be divided by 10; i.e. 123 -> 12.3
Scale 100: To transmit a value it must be multiplied by 100; i.e. 1.23 -> 123
A received value must be divided by 100; i.e. 123 -> 1.23
uint8: unsigned 8-bit integer
uint16: unsigned 16-bit integer
sint16: signed 16-bit integer
uint32: unsigned 32-bit integer
10.2.3 Reading and writing 32 bit values via Modbus
32 bit values must be read as two consecutive Modbus registers.
For example, if the fault word in the input registers 11000-11001 should be read.
B3
B2
B1
B0
MSB
LSB
Register A
Register A+1
Transmitted
First
Last
Default
B1
B0 (LSB)
B3 (MSB)
B2
Function code 10hex write multiple registers should be used.
10.2.4 Modbus function codes
The following function codes have been implemented from the standard Modbus protocol:
Function
Code
(hexadecimal)
Code
(decimal)
Remarks
Read Holding Registers
03
03
Read Input Register
04
04
Write Single Register
06
06
Diagnostics
08
08
Sub-functions
(1)
0, 10-18 & 20 (decimal)
0, 0A-12, 14 (hexadecimal)
Get Comm Event counter
0B
11
Write Multiple Registers
10
16
Read/Write Multiple Registers
17
23
Note1: Not all sub-functions return a value.
All input registers can also be read as holding registers.
10.2.5 Modbus exception codes
Code
Name
Meaning
01
Illegal function
The function code is not valid.
02
Illegal data address
The specified register is not valid
03
Illegal data value
The value is not allowed
04
Slave device failure
Unrecoverable error in slave.

Bitzer CM-SW-01 Specifications

General

Protection Class	IP20
Housing Material	Plastic
Power Consumption	5 W
Storage Temperature	+70 °C
Relative Humidity	Max. 95% r.H., no condensation

Summary

1. Read this first!

1.1 Reference guide

Guidance on thoroughly familiarizing with the reference guide.

1.2 Safety

Critical safety information and precautions for the CM-SW-01.

2. Definitions

3. Functions

3.1 Control functions

How the CM-SW-01 manages control functions via BEST Software.

3.2.1 Motor temperature

Monitors motor resistance to protect against overload.

3.2.2 Discharge temperature

Monitors discharge temperature to break safety chain.

3.2.3 Oil supply

Monitors oil level for fault detection and compressor lockout.

3.2.4 Short-cycling warning

Warns if compressor starts too many times per hour.

3.2.5 Application limits

Monitors operating conditions against safe operation area limits.

4. Datalog

4.1.1 Alarms

Logs detailed information about system alarms, including timestamp and severity.

4.1.2 Events

Records significant events like power up, start/stop, and tool connections.

4.1.3 Datalog information

Information logged when bad sections are found in datalog storage.

4.1.4 Periodic data

Data stored at regular intervals for fault traces and general operation.

4.1.5 Statistics and counters

Logs counters and statistics at midnight and power downs.

4.1.6 Accumulated operation counters

Tracks total power-ups, motor starts, and operating hours.

4.1.7 Capacity load

Details device operating time and capacity load percentages.

4.1.8 Daily counters

Tracks daily device power ups, starts, faults, warnings, and runtimes.

4.1.9 Runtime statistic

Analyzes runtime by number of runs within specific duration brackets.

4.1.10 Compressor start statistic

Tracks compressor start frequency per hour.

5. Control of the CM-SW-01

5.1 Commands and setpoint

Basic operation control via commands (Start/Stop) and setpoints.

5.1.1 Command Start

Details how the Start command is activated by digital input or serial control.

5.1.2 Setpoint - and speed changes

Explains how setpoints from analogue and serial inputs are added.

5.2 Enable serial control

Procedure to enable or disable serial control communication.

5.3 Required signals to start the compressor

Signals required to start the compressor via digital, analogue, or serial interfaces.

5.3.1 Digital and analogue signals

Signals required for starting the compressor using digital and analogue inputs.

5.3.2 Serial control (Modbus)

Signals required for starting the compressor using the serial Modbus interface.

5.4 Control Word bit definitions

Defines the bits within the Control Word for serial communication.

5.5 Examples of Serial Control Word setups:

Provides examples of serial control word configurations.

5.6 Status Word bit definitions

Defines the bits within the Status Word for monitoring operation.

5.7 Setting the serial setpoint

How to set the serial setpoint via Modbus holding register 111.

5.8 Serial Control Timeout Function

Defines reactions to communication interruption and default timeout settings.

6. I/O List for CM-SW-01

Supply Connections (CN1)

Provides supply voltage for CM-SW-01 and control outputs.

Contactor Control (CN2)

Controls contactors K1 and K2 for motor start.

High Pressure Switch Input (CN3)

Input for high pressure switch.

Control Output 1 (CN4)

Output for additional fan control.

Control Output 2 (CN5)

Output for additional fan control.

Control Outputs (CN6)

Outputs for controlling slider valves (CR+, CR-, Vi+, Vi-).

Slider Position Sensor (CN7)

Interface for slider position sensor (RS422).

Oil Sensor Input (CN9)

Input for oil level signal from OLC-D1 module.

Motor PTC Sensor (CN10)

Connects PTC sensor for motor temperature monitoring.

Auxiliary Temperature Sensor (CN11 Taux)

Input for auxiliary temperature sensor (PT1000).

Discharge Temperature Sensor (CN11 Tdis)

Input for discharge temperature sensor.

Discharge Pressure Sensor (CN12 Pdis)

Input for discharge pressure sensor.

Suction Pressure Sensor (CN12 Psuc)

Input for suction pressure sensor.

Analogue Capacity Input (CN13)

Analogue input for capacity setpoint (0-10V).

Serial Communication Interface (CN14 RS485)

Interface for Modbus (RTU) serial communication.

7. Drawings

8. Standards

9. Alarm system

9.1 Alarm severity types

Defines alarm severity levels: Fault, Critical, and Warning.

9.2 Fault reset types

Lists methods for resetting faults: Restart, External, Timed, Auto.

9.3 Alarm list

Comprehensive list of all system alarms with codes, text, and fault types.

10. Programming and monitoring

10.1 Introduction

Overview of the built-in Modbus (RTU) interface for monitoring and control.

10.2 Serial communication

Details communication via Modbus (RTU) for status reading and configuration.

10.3 Parameters

Overview of parameters grouped logically for setup via Modbus or BEST Software.

10.4 Status data

Information about current status data for alarms, compressor, device, and I/O.

10.5 Configuration data

Data related to configuration settings for application, compressor, and communication.

11. Trouble shooting

11.1 Communications trouble shooting

Steps to troubleshoot communication issues with the CM-SW-01.

11.2 Status LEDs

Explains the status LEDs (Power, Warning, Fault, COM) and their patterns.

11.3 LED flashing patterns of the three operation status LEDs

Detailed description of LED flashing patterns for different operation modes and alarms.