Cause : 24 V external power supply operation comes when the main circuit power supply is off and the 24 V external power supply is being input.

1. Power is supplied from a 24 V external power supply.
2. Turning ON the power supply (main circuit) of the inverter clears the indication.
3. If the indication is still displayed after turning ON of the power supply (main circuit) of the inverter, the power supply voltage may be low, or the jumper between the terminals P/+ and P1 may be disconnected.