Danfoss VLT Decentral Drive FCD 302 Operating Manual page 50

VLT® Decentral Drive FCD 302
Operating Guide
6.8.19 WARNING/ALARM 28, Brake Check Failed
Cause
The brake resistor is not connected or not working.
Troubleshooting
• Check parameter 2-15 Brake Check.
6.8.20 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.
6.8.21 ALARM 30, Motor Phase U Missing
Cause
Motor phase U between the drive and the motor is missing.
Troubleshooting
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.
6.8.22 ALARM 31, Motor Phase V Missing
Cause
Motor phase V between the drive and the motor is missing.
Troubleshooting
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 V.
6.8.23 ALARM 32, Motor Phase W Missing
Cause
Motor phase W between the drive and the motor is missing.
50 | Danfoss A/S © | 2020.07
W A R N I N G
W A R N I N G
Maintenance, Diagnostics and
Troubleshooting
AQ267036816112EN-000101 / 130R0208