Fanuc alarm 5
αi SVM · Fanuc αi SVM
What it means
Inverter: DC link undervoltage.
Likely causes
- DC link connection cable/bar screws loose
- PSM-side DC link undervoltage (if more than one module alarms)
- Single-SVM failure (faceplate not seated or internal fault)
Triage note: Companion CNC alarm SV0435. If multiple modules alarm together, troubleshoot PSM alarm 04 instead.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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DC link short bar / bus bar set
DC Link Bus Bar · Common cause
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A06B-6127-H2xx
Servo Amplifier Module αiSVM HV 400V (rating-dependent) · Common cause
Need the part urgently?
Send us alarm 5 with your machine details — typical RFQ turnaround is 24–48h.