ServoMR-J4Verification pending — cross-check with the official manual
MR-J4 AL.79 — Functional safety unit diagnosis error
Trip — immediate stop
CAUSE
Why does it occur?
- - A diagnosis of the functional safety unit failed
- Detail No
- Detail name Cause Check method Check result Action Target
REMEDY · Step by step
How to fix it?
Check the wiring and connection of the functional safety unit, and consider replacing the unit
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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