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Troubleshooting
Remove the power to the drive and remove the brake resistor.
7.2.26 WARNING/ALARM 28, Brake Check Failed
Cause
The brake resistor is not connected or not working.
Troubleshooting
Check parameter 2-15 Brake Check.
7.2.27 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.
7.2.28 ALARM 30, Motor Phase U Missing
Cause
Motor phase U between the drive and the motor is missing.
Troubleshooting
W A R N I N G
HAZARDOUS VOLTAGE
AC drives contain hazardous voltage when connected to AC mains or connected on the DC terminals. Failure to perform installa-
tion, start-up, and maintenance by qualified personnel can result in death or serious injury.
Only qualified personnel must perform installation, start-up, and maintenance.
Disconnect power before proceeding.
Remove the power from the drive and check motor phase U.
7.2.29 ALARM 31, Motor Phase V Missing
Cause
Motor phase V between the drive and the motor is missing.
Troubleshooting
W A R N I N G
HAZARDOUS VOLTAGE
AC drives contain hazardous voltage when connected to AC mains or connected on the DC terminals. Failure to perform installa-
tion, start-up, and maintenance by qualified personnel can result in death or serious injury.
Only qualified personnel must perform installation, start-up, and maintenance.
Disconnect power before proceeding.
Remove the power from the drive and check motor phase V.
7.2.30 ALARM 32, Motor Phase W Missing
Cause
Motor phase W between the drive and the motor is missing.
AU275636650261en-000101 / 130R0334 | 705Danfoss A/S © 2022.12
Troubleshooting
VLT AutomationDrive FC 301/302
Programming Guide
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