ServoMR-J4Verification pending — cross-check with the official manual
MR-J4 AL.8 — USB communication time-out error/serial communication time-out error/Modbus RTU
Trip — immediate stop
CAUSE
Why does it occur?
- - A communication error occurred between the servo amplifier and a personal computer/controller. - An error occurred in USB communication, serial communication (Mitsubishi Electric general-purpose AC servo protocol), or Modbus RTU communication
- Detail No
- Detail name Cause Check method Check result Action Target
REMEDY · Step by step
How to fix it?
Check the communication cable and communication parameter settings
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Summary based on the official Mitsubishi Electric manual. For accurate and complete information, always consult the official manual.
Open official manual ↗