• Disconnect power before proceeding.
• Remove the power from the drive and check motor phase W.
8.4.31 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.
8.4.32 WARNING/ALARM 34, Fieldbus Communication Fault
Cause
The fieldbus on the communication option card is not working.
8.4.33 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.
8.4.34 WARNING/ALARM 36, Mains Failure
Cause
This warning/alarm is only active if the supply voltage to the drive is lost and parameter 14-10 Mains Failure is not set to [0] No Function.
Troubleshooting
• Check the fuses to the drive and mains supply to the unit.
8.4.35 ALARM 37, Phase Imbalance
Cause
There is a current imbalance between the power units.
8.4.36 ALARM 38, Internal Fault
Cause
When an internal fault occurs, a code number defined in table 40 is shown.
Maintenance, Diagnostics, and
Troubleshooting
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707| 109
Danfoss A/S © 2020.01
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