Fanuc alarm 20
αi SPM · Fanuc αi SPM
What it means
Excessive offset of the phase V current detection circuit.
Likely causes
- SPM current-detection circuit failure (phase V)
- Loose inter-board connectors after servicing
Triage note: CNC: 750 (20). Same handling as code 19.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6112-Hxxx
Spindle Amplifier Module αiSP (rating-dependent) · Primary suspect
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SPM control PCB per model
Amplifier Control Board · Common cause
Need the part urgently?
Send us alarm 20 with your machine details — typical RFQ turnaround is 24–48h.