Alarm List - Danfoss AK-PC 651 User Manual

User Guide | Capacity Controller, AK-PC 651

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")
Po sensor error Pressure transmitter signal from Po defective
S4 sensor error Temperature signal from S4 media temp. sensor defective
Ss sensor error Temperature signal from Ss suction gas temp. defective
Sd sensor error Temperature signal from Sd 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. 1 sensor error Temperature signal from "Sd comp. 1" 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 alarms
Po Low suction pressure Minimum safety limit for suction pressure Po has been violated
LP safety switch cut out Low safety limit for external low pressure switch has been violated (DI input "LP switch")
Po High suction pressure High alarm limit for Po has been exceeded
Ss High superheat Superheat in suction line too high (measured by Po and Ss)
Ss Low superheat Superheat in suction line too low (measured by Po and Ss)
Sd High discharge temp. Safety prevention limit for Sd discharge temperature has been exceeded (10K below safety limit)
Comp. 1 High disch. temp Safety limit for discharge gas temperature of digital scroll/Stream compressor has been exceeded
Compressor 1-10 safety cut Compressor no. 1-10 has been cut out on general safety input (DI input "Comp.1-10 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 -8 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.
ERR31
Alarm on the external display - MMIGRS2
If the communication to the display is not carried out correctly, it will send an "ERR31" error
notification.
This may be caused by the displayed terminations not being installed, or that there have been
interruptions in data communication during the time when the display retrieves the basic
information from the controller.
Once the terminations have been inspected, you should then check the software version of the
external display. This is done by holding down the Enter key and and the X key for 5 seconds, until
the Bios menu appears. Next, press the X key and read off the software version in the bottom right
corner. The software version must be 1.13 or newer.
Once the display's software version has been checked, check the display's settings as follows:
1. Hold the Enter key and the X key down for 5 seconds, until the Bios menu appears.
2. Select the "MCX selection" menu
- Select the "Clear UI" line and press Enter
- Select the "Autodetect" line and press Enter
3. Press the X key to return to the Bios menu
4. Select the "COM selection" menu
- Select the "CAN" line and press Enter
5. Press the X key to return to the Bios menu
6. Select the "Start up mode" menu
- Select the "Remote application" line and press Enter
7. Press the X key to return to the Bios menu
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Reason
8. Select the "CAN" menu
- Select the "Baudrate" line and then select the "Autobaud" setting and press Enter
- Select the "Node ID" line and set the value to 126 and press Enter
9. Press the X key to return to the Bios menu
10. Select the "Application" menu and press Enter.
The display will once again retrieve data from the controller. This process will take
about 5 minutes.
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 Po Normal
High pressure Po Critical
Superheat Normal
High disch. temp.Sd Critical
Compressor safety Normal
High pressure Pc Critical
Fan safety Normal
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