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FANUC Controller
Spindle · Intermediate · 5-30 minutes
Fanuc 559 - Spindle index error
Alarm 559 SPINDLE INDEX ERROR occurs when the spindle fails to properly index or orient to the commanded position, typically during tool change operations or when rigid tapping requires precise spindle orientation. This alarm indicates the spindle control system cannot achieve or verify the correct angular position within the specified timeout period or tolerance.
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Fanuc 559 - Spindle index error
SPINDLE INDEX ERROR
Fanuc spindle alarm 559: SPINDLE INDEX ERROR. The spindle drive or spindle motor has detected a fault condition that requires diagnosis before spindle operation can resume.
Root Cause Summary
Alarm 559 SPINDLE INDEX ERROR occurs when the spindle fails to properly index or orient to the commanded position, typically during tool change operations or when rigid tapping requires precise spindle orientation. This alarm indicates the spindle control system cannot achieve or verify the correct angular position within the specified timeout period or tolerance.
Safety
- Verify corrected program or parameters before resuming machining
Causes and Fixes
- 1
Check spindle orientation sensor (proximity switch or encoder marker) for physical damage, mounting security, and proper gap distance (typically 0.5-2mm for magnetic sensors).
Lock out spindle motor power before inspecting rotating components.
- 2
Clean the sensor face and target dog/marker of metal chips, coolant residue, and contamination that may block detection.
- 3
Use PMC ladder or diagnostic screen to monitor the orientation sensor signal (typically *ORIENT or SP.ORI bit) while manually rotating spindle through index position.
- 4
Replace orientation sensor if signal is unstable or absent. Verify wiring continuity from sensor to spindle drive amplifier.
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