Cause : Low voltage comes when the inverter turns off its output if the DC voltage is below 180V 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.