AK-PC 781 Version 4.1x Menu operation RC8CE202 © Danfoss 03/2013 7
Pgc reference Bar Actual reference for gas cooler pressure
Sd discharge gas °C Actual discharge gas temperature
Sgc °C Actual temperature at outlet from the gas cooler
VSD 1 safety Status on safety input for variable speed controller on compressor 1
ON: Alarm
OFF: No alarm
VSD 2 safety Status on safety input for variable speed controller on compressor 2
ON: Alarm
OFF: No alarm
VSD Speed % The present speed of the compressor motor controlled by the frequency converter
Comp. 1 Status 0: Power up Controller has been powered up/Compressor is not used
1: Stopped Compressor hat been stopped
2: Manual Compressor capacity is controlled manually
3: Alarm Compressor is in alarm condition (cut out on safety)
4: Restart Compressor is waiting for elapse of “Recycle time”
5: Standby Compressor is ready to start
6-10: Status_RUN_Timer
11: unloaded
12-14: Unloads cutin
15: Full loaded All capacity cutin
16: Running Capacity control is running
Comp 2 … Status As above for compressor no. 2 to 8
Comp 1 capacity % Actual cut-in capacity on this compressor
Comp 2 …capacity % As above for compressor no. 2 to 8
Comp 1 Cycles / 24 h Number of compressor starts during the past 24 hours
Comp 2 …Cycles / 24 h As above for compressor no. 2 to 8
Settings Main switch Main switch: ON: Regulation
OFF: Controller stopped
1 Min. ON-time m Minimum duration of ON period
2 …Min. ON-time m As above for compressor no. 2 to 8
1 Min. OFF-time m Minimum duration of OFF period
2 …Min. OFF-time m As above for compressor no. 2 to 8
1 Recycle time m Minimum period of time between two successive starts.
2 …Recycle time m As above for compressor no. 2 to 8
1 runtime h Compressor’s total run time in hours
2 …runtime h As above for compressor no. 2 to 8
High pressure control
Measurements AK error When “ON”, the controller is in alarm condition.
Comp. ctrl. temp °C Actual temperature for control sensor (Po or S4)
Comp. ctrl. ref. °C Actual reference temp. for compressor capacity
(incl. external reference signal, if any)
Compressor cap. % Cut-in compressor capacity in % (of total capacity)
Request Comp. Cap % Reference for compressor capacity (deviations may be due to time delays)
P0 °C Suction pressure in °C. (Measured with the pressure transmitter)
Ss Suction gas °C Actual suction gas temperature
Cond. ctrl. temp °C Actual temperature for control sensor (Pc or S7)
Cond. ctrl. ref. °C Actual reference temp. for condenser capacity
(incl. external contributions, if any)
Cond. cap. % Cut-in condenser capacity in % (of total capacity)
Request Cond. cap % Reference for condenser capacity
Pc Bar Condensing pressure (measured with the pressure transmitter)
Tc °C Condensing pressure in °C. (measured with the pressure transmitter)
Gc status Actual gas cooler operation:
0=O. 1=Standby. 2=Max COP operation. 3=Heat recovery. 4=Extra capacity.
5=Manual control.
Pgc Bar Actual gas cooler pressure
Pgc reference Bar Actual reference for gas cooler pressure
Sd discharge gas °C Actual discharge gas temperature
Sgc °C Actual temperature at outlet from the gas cooler
Shp °C Read temperature at high pressure valve
Vhp OD% Read opening degree of high pressure valve
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