Fanuc alarm SP1989: SPINDLE CONTROL ERROR
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
An error occurred in serial spindle communication, attributable to failure of the hardware used for serial spindle control or to electrical noise. Functionally it pairs with SP1977 but is raised from a different point in the spindle control state machine, often during active operation rather than initialization.
Likely causes
- Noise transients on the serial spindle link during operation
- Degradation of the serial interface hardware over time
- Grounding deficiencies between CNC and drive cabinet
Need the part urgently?
Send us alarm SP1989 with your machine details — typical RFQ turnaround is 24–48h.