This fault comes when the power supply voltage of the inverter decreases, the control circuit will not perform normal functions.

1. To prevent this, In addition, the motor torque will be insufficient and/or heat generation will increase. To prevent this, if the power supply voltage decreases to about 115 VAC (230 VAC for the 400 V class) or below, this function shuts off the inverter output.
2. The warning is removed when the voltage returns to normal.
3. Check that the power supply voltage is normal.
4. Check the devices on the power system such as the power supply itself.