F061 fault in WEG CFW900 Drive indicates an IGBT/DRL Junction Overtemperature. This means the internal junction of the power modules or diodes exceeded safe thermal limits, causing a shutdown.
Cause:
- High ambient temperature around the inverter (>50 °C) and high output current.
- Blocked or defective cooling fan.
- Inverter heatsink is too dirty, preventing proper cooling airflow.
Remedy:
Check the ventilation/cooling fan. Clean the heatsink. Check ambient temperature.
