AK-PC 781A Capacity controller RS8HE202 © Danfoss 2017-07 135
Condensor
High Sd temp. High High disch. temp. SdA Safety limit for discharge temperature has been exceeded
High Pc pressure High High pressure Pc High safety limit for condensing pressure Pc has been exceeded
Pc/S7 Sensor error High
PcA sensor error Pressure transmitter signal from Pc is defective
S7A sensor error Temperature signal for S7 media temperature sensor is defective
Detect blocked air flow Medium Air flow reduced cond. A The intelligent air flow monitoring of the condenser reports that a
cleaning is due
Fan/VSD safety Medium
Fan Alarm 1 Fan no. X is reported defective via safety input
Fan VSD alarm Variable speed drive for condenser fans has been cut out on safety
Various alarms
Standby mode Medium Control stopped,
MainSwitch=OFF
The control has been stopped via the setting ”Main switch” = Off or
the external Main switch is off
Thermostat x – Low
temp. alarm
Low Thermostat x - Low alarm The temperature for thermostat no. x has been below the low alarm
limit for longer time than set delay
Thermostat x – High
temp. alarm
Low Thermostat x - High alarm The temperature for thermostat no. x has been above the high alarm
limit for longer time than set delay
Pressostat x – Low pres-
sure alarm
Low Pressostat x - Low alarm The pressure for pressostat no. x has been below the low alarm limit
for longer time than set delay
Pressostat x – alarm limit
high pressure
Low Pressostat x - High alarm The pressure for pressostat no. x has been above the high alarm
limit for longer time than set delay
Voltage input x – Low
alarm
Low Analog input x - Low alarm The voltage signal has been below the low alarm limit for longer
time than set delay
Voltage input x – High
alarm
Low Analog input x - High alarm The voltage signal has been above the high alarm limit for longer
time than set delay
User def. alarm text Low Custom alarm x -define text Alarm on general alarm input DI x
No flow High Flow switch alarm There is no flow in the heating circuit Check the pump
Boiling alarm High Boiling alarm The temperature in the heat circuit is too high
Receiver alarm High Prec... Alarm from the receiver
External power loss High External power loss Supply is interrupted. A message alert. All other alarms stopped.
Steppervalve High Stepper - Vhp, Vrec, PI, Vliq.
Open coil, Shorted output,
Error, Power failure
Check the supply to the current valve.
In the event of an error or power failure: check the supply to the
stepper module.
System alarms
The alarm priority can not be altered on system alarms
Control mode Low Manual comp. cap. Control A Compressors capacity control runs i manual mode
Control mode Low Manual cond. cap. Control A Condense capacity control runs i manual mode
Low Refrigerant A not selected Refrigerant has not been selected
Refrigerant changed Low Refrigerant changed Refrigerant type has been changed
Medium Time has not been set Time has not been set
Medium System Critical exception A unrecoverable critical system failure has occurred – exchange the
controller
Medium System alarm exception A minor system failure has occurred – power off controller
Medium Alarm destination disabled When this alarm is activated the alarm transmission to the alarm
receiver has been deactivated. Check and wait.
When the alarm is cleared the alarm transmission to the alarm
receiver has been activated again
Medium Alarm route failure Alarms can not be transmitted to alarm receiver – check communi-
cation
High Alarm router full The internal alarm buffer has an overrun – this might occur if the
controller can not send the alarms to the alarm receiver. Check com-
munication between controller and system unit.
Medium Device is restarting The controller is restarting after flash updating of the software
Medium Common IO Alarm There is a communication fault between the controller module and
the extension modules – the fault must be corrected as soon as
possible
Manual control
Low MAN DI………. The in put in question has been put in manual control mode via the
AK-ST 500 service tool software
Low MAN DO……… The output in question has been put in manual control mode via the
AK-ST 500 service tool software
Low Man set .... The output in question has been put in manual control mode via the
AK-ST 500 service tool software
Low Man control ..... The output in question has been put in manual control mode via the
AK-ST 500 service tool software
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