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9.4.26 WARNING/ALARM 28, Brake Check Failed
Cause
The brake resistor is not connected or not working.
Troubleshooting
Check parameter 2-15 Brake Check.
9.4.27 ALARM 29, Heat Sink Temp
Cause
The maximum temperature of the heat sink is exceeded. The temperature fault is not reset until the temperature drops below a
defined heat sink temperature. The trip and reset points are different based on the drive power size.
Troubleshooting
Check for the following conditions:
The ambient temperature is too high.
The motor cables are too long.
Incorrect airflow clearance above and below the drive.
Blocked airflow around the drive.
Damaged heat sink fan.
Dirty heat sink.
9.4.28 ALARM 30, Motor Phase U Missing
Cause
Motor phase U between the drive and the motor is missing.
Troubleshooting
Disconnect power before proceeding.
Remove the power from the drive and check motor phase U.
9.4.29 ALARM 31, Motor Phase V Missing
Cause
Motor phase V between the drive and the motor is missing.
Troubleshooting
Disconnect power before proceeding.
Remove the power from the drive and check motor phase V.
9.4.30 ALARM 32, Motor Phase W Missing
Cause
Motor phase W between the drive and the motor is missing.
Troubleshooting
Disconnect power before proceeding.
Remove the power from the drive and check motor phase W.
9.4.31 ALARM 33, Inrush Fault
Cause
Too many power-ups have occurred within a short time period.
Troubleshooting
Let the unit cool to operating temperature.
Check potential DC-link fault to ground.
9.4.32 WARNING/ALARM 34, Fieldbus Communication Fault
Cause
The fieldbus on the communication option card is not working.
AQ262141314214en-000301 / 130R0880 | 141Danfoss A/S © 2021.11
Maintenance, Diagnostics, and
Troubleshooting
VLT® HVAC Drive FC 102
Operating Guide
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