Cause : 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 p lace 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.

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