Fanuc alarm SP9084: SPINDLE SENSOR DISCONNECTED
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
The separate spindle sensor (external encoder on the spindle head, distinct from the motor's built-in coder) disconnected. Orientation and Cs/thread functions relying on the true spindle angle lose their feedback source.
Likely causes
- External encoder cable broken or unplugged
- Failed spindle-mounted encoder head
- Connector contamination from coolant
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A860-0360-B101
Spindle position coder / external encoder · Common cause
Need the part urgently?
Send us alarm SP9084 with your machine details — typical RFQ turnaround is 24–48h.