Bitzer CM-RC-01, Reference Manual

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v. 3.0 Reference guide
Compressor Control Module CM-RC-01
3.0
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2.
General
The compressor control module CM-RC-01 is used for protection, control and diagnosis of
primarily reciprocating compressors. It is mounted in its own housing and connected to all the
sensors and components mounted on the compressor.
Its relays are used for compressor start and for the safety chain for the compressor and will open
in case of a critical failure.
The module has indicator lights visible from outside of the housing. It can be used as a stand-
alone control and protection module, or connected to a System Controller via the communication
bus to extend possibilities.
Some basic module setup related to motor-, compressor- and refrigerant type must be done to
enable all available protection functions. This is done with the BITZER BEST Software.
The CM-RC-01 module monitors and controls compressor operation according to the following
functions:

Motor overload

Oil level or oil pressure differential

Discharge gas temperature

Saturated suction and discharge gas temperature based on pressure readings

Absolute limits for low suction pressure and high discharge pressure

Motor start with built-in timers

Start-unloading control

Capacity control (CRII)

Liquid injection cooling (CIC)

Additional fan cooling control

Compressor application limits monitoring based on saturated gas temperatures

Modbus communication
2.1 Support information
BITZER Kühlmachinenbau GmbH
Eschenbrünnlestraẞe 15 // 71065 Sindelfingen // Germany
Tel +49 (0) 70 31 932-0 // Fax +49 (0) 70 31 932-147
bitzer@bitzer.de // www.bitzer.de