Cause : Main Circuit Capacitor Neutral Point Potential Error comes when a loss in capacity due to aging of the main circuit capacitor or the Inverter parts are faulty.

1. An open phase was detected for an output.
2. Carrier frequency set value (C6-03, C6- 04) is unsuitable.
3. Check the set values for C6-03 and C6-04.
4. The maximum output frequency that can be set for 400 V Class Inverters is restricted by the carrier frequency setting.