Fanuc alarm SP9073: MOTOR SENSOR DISCONNECTED
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
The motor-integrated sensor (built-in serial coder of the alpha i spindle motor) disconnected: its serial data stream ceased. All speed and orientation feedback is lost simultaneously, forcing an immediate coast-down.
Likely causes
- Broken or unplugged motor feedback cable
- Failed built-in sensor head
- Damage at the motor connector from vibration or coolant ingress
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
- View part →
A860-2000-T301
alpha i built-in motor sensor (Mi coder) · Common cause
Need the part urgently?
Send us alarm SP9073 with your machine details — typical RFQ turnaround is 24–48h.