Danfoss Vacon NXP Applications Manual page 127

Fault codes
F9 Undervoltage fault
DC link voltage is below the fault voltage limit of the drive.
S1 = DC link too low during the run.
S2 = No data from the power unit.
S3 = Undervoltage control supervision.
Possible cause
- Too low a supply voltage.
- AC drive internal fault.
- One of the input fuses is broken.
- External charge switch has not been closed.
Correcting measures
- In case of temporary supply voltage break, reset the fault and restart the AC drive.
- Check supply voltage.
- Check the operation of the DC charge.
- Contact your local distributor.
F10 Line Synchronization Fault
S1 = Phase supervision diode supply.
S2 = Phase supervision active front end.
S3 = Grid Converter operation, frequency outside frequency limits (G2.6.3).
Possible cause:
- Input line phase is missing.
- No grid to be synchronized
- Slow power increase in a grid and limit controllers has activated.
- Power or current limits too low for the active load.
Correcting measures
- Check supply voltage, fuses and cable.
- Check drive dimensioning against grid power requirements.
- Check that power or current limits are sufficient.
F11 Line phase supervision
Possible cause:
- Current measurement has detected that there is no current in one phase, or one phase
current is considerably different from other phases.
Correcting measures
- Check the motor cable and the motor.
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