F022 fault in WEG CFW900 Drive indicates a DC Link Overvoltage. This means the internal DC bus voltage has spiked too high, typically caused by rapid deceleration of a heavy load.
Cause:
Supply voltage is too high, producing voltage on the DC link (S2.7.1) above the maximum permitted value:
- Ud > 400 V: Models 200-240 V.
- Ud > 800 V: Models 380-480 V.
- Ud > 1000 V: Models 500-600 V.
- Ud > 1200 V: Models 660-690 V.
- Driven load inertia too high or deceleration ramp set too fast.
- Parameter C3.5.2.1, C3.5.3.2, or C3.6.1 setting is too high.
Remedy:
Check the incoming mains supply voltage. Increase deceleration ramp time, adjust load inertia, or reduce parameters C3.5.2.1, C3.5.3.2, or C3.6.1.
