[MCXX] Relay connected to the motor ON output is welded, or the welding diagnostic circuit has failed. (Servo board XX)(Code:XX) (for E0x series controllers)

Error handling: Motor power OFF.
Error reset: Possible.

Description: When the motor power is turned OFF, the power supply unit control board (1VH) cannot detect the OFF state of the external relay connected to connector X313.

Main causes:

1. Poor connection of the X313 jumper (between A1-B1), or a relay connected to X313 is stuck.

2. A poor controller connection, open circuit, or similar problem in the wiring between the X320 connectors (24V brake supply system) on the power supply unit control board.

3. A problem with the power supply unit control board or power supply unit power board.

Countermeasures:

1. Check connector X313 and the wiring between A1-B1.

2. Check the wiring to X320.

3. Replace the power supply unit.