Mitsubishi Electric · FR-A800 Variable Speed Drive (Separated Converter)
This fault indicates a short circuit in the power supply circuit for the operation panel (FR-DU08) or parameter unit (FR-PU07) connected to the PU connector of the FR-A800/A800 Plus Series drive. This prevents proper operation panel functionality.
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Disconnect the operation panel (FR-DU08) or parameter unit (FR-PU07) from the PU connector and power cycle the drive. If the fault clears, the panel or its cable is likely the cause.
Inspect the cable connecting the operation panel for any damage, pinches, or signs of a short circuit.
Examine the PU connector on the FR-A800/A800 Plus Series drive for bent pins, debris, or foreign material.
If the fault persists with the panel disconnected, it may indicate an internal issue with the drive's power supply to the PU connector.
Test with a different, known-good operation panel or parameter unit if available, to confirm if the panel itself is faulty.