Fanuc alarm SV0439
βi SVU/SVM · Fanuc βi SVU/SVM
What it means
Converter: DC link overvoltage.
Likely causes
- Regenerated energy not absorbed (deceleration too fast for regen capability)
- External/internal regen resistor open circuit
- Converter overvoltage-sense circuit failure
Triage note: Measure regen resistor continuity first; open resistor is the dominant field cause. αi equivalent: PSM 07.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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βi regenerative resistor unit per machine spec
Regenerative Resistor Unit · Primary suspect
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A06B-6130-H2xx
βi Servo Amplifier Unit SVU · Check if others ruled out
Need the part urgently?
Send us alarm SV0439 with your machine details — typical RFQ turnaround is 24–48h.