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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 W.
7.2.31 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.
7.2.32 WARNING/ALARM 34, Fieldbus Communication Fault
Cause
The fieldbus on the communication option card is not working.
7.2.33 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.
7.2.34 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 Func-
tion.
Troubleshooting
Check the fuses to the drive and mains supply to the unit.
7.2.35 ALARM 37, Phase Imbalance
Cause
There is a current imbalance between the power units.
7.2.36 ALARM 38, Internal Fault
Cause
When an internal fault occurs, a code number defined in
Table 1439 is shown.
Troubleshooting
Cycle power.
Check that the option is properly installed.
Check for loose or missing wiring.
It may be necessary to contact the Danfoss supplier or service department. Note the code number for further troubleshooting guid-
ance.
Table 1439: Internal Fault Codes
The serial port cannot be initialized. Contact the Danfoss supplier or Danfoss service department.
The power EEPROM data is defective or too old. Replace the power card.
AU275636650261en-000101 / 130R0334706 | Danfoss A/S © 2022.12
Troubleshooting
VLT AutomationDrive FC 301/302
Programming Guide
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