IGBT over-heating warning

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

Check if the ambient temperature or temperature inside the cabinet is too high, or if there is obstruction in the ventilation hole of the control cabinet.

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