Cause : 24 VDC power fault comes when he 24 VDC power output from the PC terminal is shorted, this function shuts off the power output. At this time, all external contact inputs switch OFF. The inverter cannot be reset by entering the RES signal. To reset it, use the operation panel, or switch power OFF, then ON again.

1. Check for a short circuit in the PC terminal output.
2. Check that the 24 V external power supply voltage is correct.
3. Repair the short-circuited portion.
4. Supply the power at 24 V. (If the power at insufficient voltage is supplied to the 24V input circuit for a long time, the inverter internal circuit may heat up. Input power at correct voltage although it will not damage the inverter.)