F006 fault in WEG CFW900 Drive indicates Grid Unbalance or Phase Loss. This means the incoming mains voltage is uneven or a phase is completely missing, preventing stable power delivery.
Cause:
- Phase loss at the inverter input.
- Input voltage unbalance > 5%.
- Loss of one phase in the power supply.
Note: In case the motor has no load on the shaft or the load is low, this fault may not occur. Actuation time is set to C7.1.1. When C7.1.1=0, the fault is disabled.
Remedy:
Check input grid voltage balance and secure connections on mains lines. Verify there are no open circuit fuses. If required, disable this check by setting parameter C7.1.1 = 0.
