Danfoss VLT HVAC Drive FC 102 Operating Manual page 153

Operating Guide | VLT® HVAC Drive FC 102
Troubleshooting
• Check wiring.
• Check the on-board temperture sensor.
• Replace fan power card.
9.3.98 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.
9.3.99 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.
9.3.100 ALARM 425, FPC Update Failure
Cause
This alarm is generated after the control card failed to update the fan power card PUD.
Troubleshooting
• Check the fan power card wiring.
• Replace fan power card.
• Contact supplier.
9.3.101 ALARM 426, FPC Config
Cause
The number of found fan power cards do not match the number of configured fan power cards. See parameter group 15-6* Option Ident
for the number of configured fan power cards.
Troubleshooting
• Check fan power card wiring.
• Replace fan power card.
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Maintenance, Diagnostics, and
Troubleshooting
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