Cause : Undervoltage comes when the power supply voltage of the inverter decreases, the control circuit will not perform normal functions. In addition, the motor torque will be insufficient and/or heat generation will increase.

1. To prevent this, if the power supply voltage decreases below about 115VAC (230VAC for 400V class), this function stops the inverter output and displays . An alarm is reset when the voltage returns to normal.
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.