ServoMR-J4Verification pending — cross-check with the official manual
MR-J4 AL.90 — Home position return incomplete warning
Trip — immediate stop
CAUSE
Why does it occur?
- - Home position return has not been finished. - Home position return did not complete properly. - Home position return was performed with the Z-phase unpassed. Detail No. Detail name Cause Check method Check result Action Target 90.1 Home position return incomplete (
- Home position return has not been performed. Check if home position return has been performed. A home position return was not exec
REMEDY · Step by step
How to fix it?
Ease the deceleration conditions and review the regenerative resistor capacity.
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.
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