Troubleshooting
• Remove the power to the drive and remove the brake resistor.
9.3.27 WARNING/ALARM 28, Brake Check Failed
Cause
The brake resistor is not connected or not working.
Troubleshooting
• Check parameter 2-15 Brake Check.
9.3.28 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
• 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.
9.3.29 ALARM 30 Motor Phase U Missing
Cause
Motor phase U between the drive and the motor is missing.
Troubleshooting
WAR N I N G
HIGH VOLTAGE
AC drives contain high voltage when connected to AC mains input , DC supply , or load sharing. Failure to perform installation ,
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.
Maintenance, Diagnostics, and
Troubleshooting
Operating Guide | VLT® AQUA Drive FC 202
AQ262141056213en-000101 / 130R0882 | 141
Danfoss A/S © 2018.10
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