Fanuc alarm SP1972: SPINDLE CONTROL ERROR
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
[M series] Gear 4 was selected during rigid tapping, a combination the rigid-tap implementation does not support. The CNC detects the illegal gearing state and stops with a spindle control error rather than attempt an undefined tap cycle.
Likely causes
- Program or PMC selecting fourth gear range within a rigid tap cycle
- Gear-selection signals from the PMC inconsistent with tap-cycle expectations
- Gear range parameters permitting a combination invalid for rigid tapping
Triage note: Restrict rigid tapping to supported gear ranges in ladder and program.
Need the part urgently?
Send us alarm SP1972 with your machine details — typical RFQ turnaround is 24–48h.