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EN/07.2013/58/39

4. Control functions

4.1. Temperature control

The parameters involved are:

• S28 COOLING BAND FOR DANFOSS COMPRESSOR: pre-set = 5°C

• M158 ENABLE DANFOSS COMPRESSOR: pre-set = NO

• M159 THERM SETUP CRANK CASE HEATING ON TEMP: pre-set = 10 °C

• M160 MANUAL OD PCT: pre-set = 0 %

• M161 MANUAL CONTROL: pre-set = 0

• M162 MAXIMUM SUPERHEAT: pre-set = 160 K

• M163 MINIMUM SUPERHEAT: pre-set = 40 K

• M164 MOP: pre-set = 137 Bar

• M165 COMPRESSOR INTEGRAL TIME: pre-set = 0 Sec

• M169 MAX COMPRESSOR SPEED DURING NIGHT MODE: pre-set = 70 %

• M179 COMPRESSOR CONTROL BY SUPPLY TEMPERATURE: pre-set = NO

• M184 THERM SETUP UNIT TYPE: pre-set = 0

• M185 THERM SETUP SYSTEM CONFIGURATION: pre-set = 6

• M186 THERM SETUP COMPRESSOR MAX SPEED: pre-set = 70 Hz

• M187 THERM SETUP OIL LOSS TRIG TIME: pre-set = 18000 Sec

• M188 THERM SETUP START UP HOLD TIME: pre-set = Sec

When parameter M158 is set to YES, the C2020 controller communicates with a Danfoss compressor through the RS485

serial port. The communication protocol is automatically set to ModBus, the baud rate is automatically set to 19200 bps.

The Danfoss compressor can be connected only to the SLAVE connector.

The control of Danfoss compressor starts after 20 seconds from the switching on of the C2020 controller.

When Danfoss compressor is enabled, PC and TAE are read by Danfoss compressor (data points Modbus 40204 and

40216).

The temperature control is delayed of 30 seconds from the switching on of the C2020 controller. The access to the data

points Modbus is performed every 200 ms.

In the following table are shown all data points ModBus for the communication with the Danfoss compressor.

Stulz C2020 User Manual

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