Fanuc alarm b
αi SVM · Fanuc αi SVM
What it means
Inverter: motor current alarm (L axis) - abnormal motor current detected via current feedback.
Likely causes
- Short circuit / ground fault in power leads
- Motor winding short / insulation breakdown
- Incorrect motor ID setting or overly aggressive acc/dec (parameters 2004/2040/2041 group)
- SVM or motor failure
Triage note: CNC alarm SV0438 detail b. Check default parameters and lengthen acc/dec if alarm occurs only on rapid reversal before condemning hardware.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6114-H2xx
Servo Amplifier Module αiSVM (rating-dependent) · Primary suspect
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A06B-02xx/03xx-Bxxx
αiS/αiF Servo Motor (if insulation test fails) · Common cause
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Motor power lead set
Motor Power Cable · Common cause
Need the part urgently?
Send us alarm b with your machine details — typical RFQ turnaround is 24–48h.