• Ambient temperature too high.
• Motor cables too long.
• Incorrect airflow clearance above or below the AC drive.
• Blocked airflow around the unit.
• Damaged heat sink fan.
• Dirty heat sink.
8.4.95 WARNING 251, New Typecode
Cause
The power card or other components have been replaced, and the typecode has changed.
8.4.96 ALARM 421, Temperature Fault
Cause
A fault caused by the on-board temperature sensor is detected on the fan power card.
Troubleshooting
• Check wiring.
• Check the on-board temperature sensor.
• Replace fan power card.
8.4.97 ALARM 423, FPC Updating
Cause
The alarm is generated when the fan power card reports it has an invalid PUD. The control card attempts to update the PUD. A
subsequent alarm can result depending on the update. See Alarm 424, FPC Update Successful and Alarm 425 FPC Update Failure.
8.4.98 ALARM 424, FPC Update Successful
Cause
This alarm is generated when the control card has successfully updated the fan power card PUD.
Troubleshooting
• Press [Reset] to stop the alarm.
8.4.99 ALARM 425, FPC Update Failure
Cause
This alarm is generated after the control card failed to update the fan power card PUD.
Maintenance, Diagnostics, and
Troubleshooting
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707
122 | Danfoss A/S © 2020.01
To Next Page
Loading...
Need help?
General