Cause : Undervoltage comes when the power supply voltage of the inverter decreases, the control circuit will not perform normal functions.

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.