A020 alarm in WEG CFW900 Drive indicates a 24Vdc Power Supply Undervoltage. This means the external 24V control power supply has dropped below the minimum operational threshold.
Cause:
- Voltage of the 24 Vdc power supply that feeds the control is below the minimum permitted value of 22.8 Vdc.
Remedy:
Check the incoming 24 Vdc supply wiring and voltage levels. Ensure the external power source is rated correctly.
