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Troubleshooting
W A R 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.
9.3.29 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
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.
9.3.30 ALARM 32, Motor Phase W Missing
Cause
Motor phase W between the drive and the motor is missing.
Troubleshooting
W A R 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 W.
9.3.31 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.
9.3.32 WARNING/ALARM 34, Fieldbus Communication Fault
Cause
The fieldbus on the communication option card is not working.
9.3.33 WARNING/ALARM 35, Option Fault
Cause
An option alarm is received. The alarm is option-specific. The most likely cause is a power-up or a communication fault.
AQ357954340588en-000201 / 130R0881
128 | Danfoss A/S © 2020.09
Maintenance, Diagnostics, and
Troubleshooting
VLT® Refrigeration Drive FC 103
Operating Guide
Summary of Contents for VLT FC 103
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