IGBT over-heating warning (oH1)

The AC motor drive detects IGBT overheating and exceeds the protection level of oH1 warning. (When Pr.06-15 is higher than the IGBT overheating protection level, the drive shows oH1 error without displaying oH1 warning.)

“oH1” warning occurs when IGBT temperature is higher than Pr.06-15 setting value.

1. Check the ambient temperature.
2. Regularly inspect the ventilation hole of the control cabinet.
3. Change the installed place if there are heating objects, such as brake
resistors, in the surroundings.
4. Install/ add cooling fan or air conditioner to lower the temperature inside the
cabinet

Check if the drive matches the corresponded loading

1. Decrease loading.
2. Decrease the carrier wave.
3. Replace with a drive with larger capacity.