Mitsubishi Electric MR-J4 Instruction Manual page 758

APPENDIX
App. 5.11 Troubleshooting
When power is not supplied or FAULT LED turns on, refer the following table and take the appropriate
action.
Event
Power is not supplied. Power LED does not turn on
although power is supplied.
FAULT LED is on. FAULT LED of A-axis or B-
axis is on, and will not turn
off.
Description
1. 24 V DC power supply is
malfunctioning.
2. Wires between MR-J3-D05 and 24
V DC power supply are
disconnected or are in contact with
other wires.
3. MR-J3-D05 is malfunctioning.
1. The delay time settings are not
matched.
2. Switch input error
3. TOF signal error
4. MR-J3-D05 is malfunctioning.
App. - 33
Cause
Replace the 24 V DC power supply.
Check the wiring.
Replace the MR-J3-D05.
Check the settings of the rotary
switch.
Check the wiring or sequence of the
input signals.
Check the connection with the servo
amplifier.
Replace the MR-J3-D05.
Action