Cause : Operation panel power supply short circuit comes when the power supply for the operation panel (PU connector) is shorted, the power output is shutoff and the inverter trips. The use of the operation panel (parameter unit) and the RS-485 communication via the PU connector are disabled. To reset, enter the RES signal from the terminal, reset via communication through the RS-485 terminals, or switch power OFF then ON again.

1. When the power supply for the RS-485 terminals are short circuited, this function shuts off the power output. At this time, communication from the RS-485 terminals cannot be made.
2. Check that the PU connector cable is not shorted.
3. Check that the RS-485 terminals are connected correctly.
4. Check PU and the cable.