Code

Name

Causes

Possible Solutions

oH1

Heatsink Overheat

The ambient temperature is high and the heatsink temperature of the drive is more than the oH1 detection level.

  • Measure the ambient temperature.

  • Increase the airflow in the control panel.

  • Install a cooling device (cooling fan or air conditioner) to lower the ambient temperature.

  • Remove objects near the drive that are producing too much heat.

The load is too heavy.

  • Measure the output current.

  • Decrease the load.

  • Decrease the value set in C6-02 [Carrier Frequency Selection].
Note:

  • The drive detects this fault if the heatsink temperature of the drive is more than the oH1 detection level. o2-04 [Drive Model (KVA) Selection] determines the oH1 detection level.

  • Do a Fault Reset to clear the fault.

  • L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.