Fanuc alarm SP9051: LOW VOLTAGE DC LINK (PSM FAULTY)
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
The DC link voltage fell below the required minimum as judged by the power supply module. The converter could not maintain bus voltage, typically because input power collapsed or the PSM's rectification stage failed.
Likely causes
- Input voltage sag or phase loss under load
- Failed rectifier devices in the PSM
- Blown input fusing on one leg
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6110-Hxxx
alpha i Power Supply Module (PSM) · Common cause
Need the part urgently?
Send us alarm SP9051 with your machine details — typical RFQ turnaround is 24–48h.