Alarm List - Danfoss AK-PC 551 User Manual

Alarm list

Alarm text
General alarms
Standby mode (Main sw. OFF) Alarm when control is stopped by internal or external Main Switch (DI input "Main Switch")
PoA sensor error Pressure transmitter signal from PoA defective
PoB sensor error Pressure transmitter signal from PoB defective
S4A sensor error Temperature signal from S4A media temp. sensor defective
S4B sensor error Temperature signal from S4B media temp. sensor defective
SsA sensor error Temperature signal from SsA suction gas temp. defective
SsB sensor error Temperature signal from SsB suction gas temp. defective
SdA sensor error Temperature signal from SdA discharge gas temp. Sd defective
SdB sensor error Temperature signal from SdB discharge gas temp. Sd defective
Pc sensor error Pressure transmitter signal from Pc defective
S7 sensor error Temperature signal from S7 media sensor on condenser defective
Sc3 sensor error Temperature signal from Sc3 air on condenser defective
Sd Comp. 1A sensor error Temperature signal from "Sd comp. 1A" discharge gas temp. on digital scroll/Stream compressor is
defective
Sd Comp. 1B sensor error Temperature signal from "Sd comp. 1B" discharge gas temp. on digital scroll/Stream compressor is
defective
Saux - sensor error Temperature signal from Saux thermostat sensor is defective
Refrigerant not selected Alarm if no refrigerant has been selected
Output in manual mode An output is set in manual mode
IO configuration error Not all inputs and output functions have been assigned to hardware Inputs or outputs*
GA1 - "Alarm text" Alarm on general alarm input DI 1 (DI input "Gen. Alarm 1 - alarm text depend upon configured text)
GA2 - "Alarm text" Alarm on general alarm input DI 2 (DI input "Gen. Alarm 2 - alarm text depend upon configured text)
GA3 - "Alarm text" Alarm on general alarm input DI 3 (DI input "Gen. Alarm 3 - alarm text depend upon configured text)
Suction A alarms
PoA Low suction pressure Minimum safety limit for suction pressure PoA has been violated
LP A safety switch cut out Low safety limit for external low pressure switch has been violated (DI input "LP switch A")
PoA High suction pressure High alarm limit for PoA has been exceeded
SsA High superheat Superheat in suction line A too high (measured by PoA and SsA)
SsA Low superheat Superheat in suction line A too low (measured by PoA and SsA)
SdA High discharge temp. Safety prevention limit for SdA discharge temperature has been exceeded (10K below safety limit)
Comp. 1A High disch. temp Safety limit for discharge gas temperature of digital scroll/Stream/CRII compressor has been exceeded
Compressor 1-8A safety cut Compressor no. 1-8 A has been cut out on general safety input (DI input "Comp.1-8 A safety")
out
Suction B alarms
PoB Low suction pressure Minimum safety limit for suction pressure PoB has been violated
LP B safety switch cut out Low safety limit for external low pressure switch has been violated (DI input "LP switch B")
PoB High suction pressure High alarm limit for PoB has been exceeded
SsB High superheat Superheat in suction line B too high (measured by PoB and SsB)
SsB Low superheat Superheat in suction line B too low (measured by PoB and SsB)
SdB High discharge temp. Safety prevention limit for SdB discharge temperature has been exceeded (10K below safety limit)
Comp. 1B High disch. temp Safety limit for discharge temperature of digital scroll/Stream compressor has been exceeded
Compressor 1-4B safety cut Compressor no. 1-4 B has been cut out on general safety (DI input "Comp.1-4 B safety")
out
Condenser alarms
Pc High condensing pressure High prevention safety limit for condensing pressure Pc has been violated (3K below safety limit)
HP safety switch cutout High safety limit for external high pressure switch has been violated (DI input "HP switch")
Common fan safety cut out A Fan is reported defective via common safety input (DI input "Fan safety")
Fan 1 safety cut out Fan no. 1-8 is reported defective via individual safety input (DI input "Fan 1-8 safety")
* The alarm "IO configuration error" is activated if not all IO functions have been assigned to a hardware Input or output.
Often the reason is that too many functions have been selected via the configuration of the controller.
Go to the menu point "Main menu => IO status => IO summary".
In this screen you can see if you have configured too many functions of a certain type - indicated by an exclamation mark " ! "
Please refer to the screen example, were too many DO functions have been configured.
Solve the problem by adapting the DO functions to the max. No of DO outputs.
Sensor alarms
Sensor alarms shut off automatically when the sensor has been O.K. for 10 minutes.
If you have corrected the sensor error and want to perform a manual, forced removal of the alarm, go to the "Alarm detail display"
Press and hold the "X" key for 2 seconds here.
AK-PC 551 User Guide RS8GY302 © Danfoss 2015-06
Reason Priority Default
setting value
Standby mode Normal
Sensor error Normal
Refrigerant not set Normal
Output in MAN mode Normal
(can not be set) Normal
General alarm 1 Normal
General alarm 2 Normal
General alarm 3 Normal
Low pressure PoA Normal
High pressure PoA Critical
Superheat A Normal
High disch. temp.SdA Critical
Compressor safety A Normal
Low pressure PoB Normal
High pressure PoB Critical
Superheat B Normal
High disch. temp.SdB Critical
Compressor safety B Normal
High pressure Pc Critical
Fan safety Normal
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