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. To prevent this, if the power supply voltage decreases to about 150 VAC (300 VAC for the 400 V class) or below, this function shuts off the inverter output.

1. When a jumper is not connected across P/+ and P1, the undervoltage protective function is activated.
2. When undervoltage protection is activated, the IPF signal is output.
3. Check if a high-capacity motor is driven.
4. Check if the jumper is connected across terminals P/+ and P1.
5. Check the power supply system equipment such as the power supply.