Fanuc alarm H
αi PSMR · Fanuc αi PSM
What it means
Temperature of the regenerative resistor has risen abnormally.
Likely causes
- Regenerative resistor thermal-signal wiring open/not detected
- Insufficient regenerative resistance for acceleration duty
- Excessive regeneration frequency (rapid acc/dec cycles)
- Regen resistor cooling fan stopped
Triage note: Mirrors as SP0057 / 9057. Review acc/dec frequency before upsizing hardware.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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Machine-spec regenerative resistor unit
Regenerative Resistor Unit · Primary suspect
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A06B-6077-H126
Power Supply Module α PSMR · Check if others ruled out
Need the part urgently?
Send us alarm H with your machine details — typical RFQ turnaround is 24–48h.