Fagor alarm 4139: ERROR 310: Low voltage at the driver of the High Side IGBT
CNC 8055 SERCOS drive error (DDS) · Fagor DDS drives
What it means
The floating gate-driver supply for the high-side IGBT collapsed, risking partial conduction and device destruction. PWM is interrupted (category 0 stop) with the usual CNC-wide shutdown. Persistent cases require service or drive replacement.
Likely causes
- Defective bootstrap/driver supply for the high side
- Failing IGBT loading the driver
- Internal supply component degradation
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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DDS / AXD / SPD drive
drive · Common cause
Need the part urgently?
Send us alarm 4139 with your machine details — typical RFQ turnaround is 24–48h.