Cause : Low voltage comes when the DC voltage is below rated voltage because insufficient torque or overheating of the motor can occur when the input voltage of the inverter drops.

1. Line voltage is low.
2. Check whether line voltage is below its rating.
3. Load larger than line capacity is connected to line.
4. Check the incoming AC line. Adjust the line capacity corresponding to the load.
5. Faulty magnetic switch at the input side of the inverter.
6. Change a magnetic switch.