Bitzer CM-SW-01

Other manuals for Bitzer CM-SW-01

Questions and Answers:

Jeremy HartAug 2, 2025

What to do if Bitzer CM-SW-01 Control Unit relays are not energized after power on?

S
Sean BrownAug 2, 2025
If the relays in your Bitzer Control Unit aren't energizing after powering on and reapplying the run signal, try the following: * Turn off the power for 5 seconds and check if the relays energize upon restart. * If the PTC-sensor temperature is too high (resistance above 11.4 kΩ ±20%), the fault relay will release to protect the motor. * A broken connection to the PTC-sensor (resistance more than 1 MΩ) will also prevent relay engagement. * A short circuit on the PTC-sensor cables (resistance near zero Ω) will disable overheat protection. * If all three phases are within range and resistance is below 2.9 kΩ ±20%, the compressor module may be defective and require replacement.

ireevesAug 18, 2025

How to troubleshoot communication issues with Bitzer Control Unit?

E
Erik CallahanAug 18, 2025
To troubleshoot communication problems with your Bitzer Control Unit: * First, verify the communication cables are correctly wired. * Next, ensure the communication address setting matches the selected address. * Also, confirm the communication speed matches the selected speed; use the BEST Software to check these settings. * Finally, check if communication is active.

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

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.

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.

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.

Table of Contents