Cause : Cooling - comes when drive module temperature is excessive due fan not working or faulty temperature sensor. Check following to correct fault :

1. Check ambient temperature.
2. If it exceeds 50 °C /122 °F, ensure that load current does not exceed derated load capacity of drive.
3. Check drive module cooling air flow and fan operation.
4. Check inside of cabinet and heatsink of drive module for dust pick-up.
5. Clean whenever necessary.