Mitsubishi MR-J2S Alarm AL.32 — What It Means and What It Costs to Fix
AL.32 is the MR-J2S overcurrent alarm, and on this family it overwhelmingly means one thing: the IPM — the intelligent power module — has failed. It is the classic J2S death, it is repairable, and the one thing you must NOT do is bolt a replacement amplifier onto an un-tested motor.
What's usually behind it
Failed IPM (the usual verdict)
The amplifier's intelligent power module shorts internally. The alarm appears instantly at enable, or the breaker trips at power-on. Repair replaces the IPM with a new module, verifies gate drive, recaps the bus, and powered-tests the amp — typically $450–$950.
Shorted motor or cable
A winding-to-winding or winding-to-ground short presents as amplifier overcurrent — and will destroy the next amplifier too. Megger the motor phases to ground before installing anything. Our free evaluation tests the amplifier independently, so if the amp is healthy you pay nothing and you've safely convicted the motor side.
Regeneration circuit faults (AL.30 family)
If you're seeing AL.30 rather than AL.32, the regeneration path (resistor or internal circuit) is the suspect — also a board-level repair.
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