Fanuc alarm SV0654: DB RELAY ABNORMALITY
0i-D servo alarm (dynamic brake) · Fanuc 0i-D
What it means
Dynamic-brake relay in the servo amplifier abnormal (welded contacts/coil failure detected)
Likely causes
- DB relay welded after repeated e-stop stops
- amplifier internal drive circuit failure
Triage note: Manual explicitly directs amplifier replacement - relay is not serviced separately on beta i units
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6134-H303
Servo Amplifier Unit (beta i SVM) · Primary suspect
Need the part urgently?
Send us alarm SV0654 with your machine details — typical RFQ turnaround is 24–48h.