Fanuc alarm SP1987: SERIAL SPINDLE CONTROL ERROR
spindle alarm (serial spindle interface, CNC side) · Fanuc 0i-D
What it means
A fault was found in the SIC-LSI on the CNC side, i.e. the spindle interface controller mounted in the control unit rather than in the amplifier. Data written to or read from this device failed verification.
Likely causes
- Failed spindle interface ASIC on the CNC motherboard or option board
- Board seating/contact problems after servicing
Triage note: Points to CNC main board or spindle interface board replacement.
Need the part urgently?
Send us alarm SP1987 with your machine details — typical RFQ turnaround is 24–48h.