When a serial spindle alarm occurs in a FANUC CNC system, the CNC displays an alarm number for diagnosis.
If the red LED on the spindle amplifier lights up, a two-digit alarm code is shown.
⚠️ Important Notes:
- A yellow LED indicates a sequence-related issue, not a hardware fault
- Example: spindle rotation command issued while emergency stop is active
- Alarm meanings differ depending on LED status
For alarm codes not listed here, refer to: FANUC AC Spindle Motor αi Series Maintenance Manual (B-65285EN)
FANUC Spindle Alarm List (SP9001–SP9033)
1) SP9001 – SP9005
| Alarm Code | Message | Amplifier Display | Cause | Troubleshooting |
|---|---|---|---|---|
| SP9001 | SSPA:01 Motor Overheat | 01 | Motor internal temperature exceeded due to overload or cooling failure | Check ambient temperature and load, replace cooling fan if necessary |
| SP9002 | SSPA:02 Excessive Speed Deviation | 02 | Motor cannot follow commanded speed due to high load or insufficient acceleration/deceleration parameter | Reduce load, adjust parameter No.4082 |
| SP9003 | SSPA:03 DC LINK Fuse Blown | 03 | DC LINK voltage insufficient due to internal fuse failure, possible motor insulation fault | Replace amplifier, check motor insulation |
| SP9004 | SSPA:04 Power Phase Loss | 04 | Input power phase loss detected in power supply | Check power voltage and wiring |
| SP9006 | Thermal Relay Disconnection | 06 | Motor temperature sensor disconnected | Check parameters, replace feedback cable |
2) SP9007 – SP9012
| Alarm Code | Message | Amplifier Display | Cause | Troubleshooting |
|---|---|---|---|---|
| SP9007 | SSPA:07 Overspeed | 07 | Motor speed exceeds 115% or position deviation accumulates | Check command sequence |
| SP9009 | SSPA:09 Main Circuit Overheat | 09 | Heat sink temperature too high | Improve cooling, replace amplifier if needed |
| SP9010 | SSPA:10 Input Voltage Low | 10 | Voltage drop at amplifier input | Check power supply and cables |
| SP9011 | SSPA:11 DC LINK Overvoltage | 11 | DC LINK overvoltage due to improper power selection or voltage fluctuation | Check power supply and configuration |
| SP9012 | SSPA:12 DC LINK Overcurrent | 12 | Excessive motor current or parameter mismatch | Check motor insulation and parameters |
3) SP9013 – SP9024
| Alarm Code | Message | Amplifier Display | Cause | Troubleshooting |
|---|---|---|---|---|
| SP9013 | CNC Memory Error | 13 | Internal RAM failure in amplifier | Replace amplifier |
| SP9014 | Software Mismatch | 14 | Software mismatch between CNC and amplifier | Replace amplifier |
| SP9015 | Spindle Switching Error | 15 | Sequence abnormal during spindle switching | Check ladder logic, replace contactor |
| SP9016 | RAM Error | 16 | External RAM failure | Replace amplifier |
| SP9017 | ID Parity Error | 17 | Abnormal ID data | Replace amplifier |
| SP9018 | ROM Checksum Error | 18 | ROM abnormal | Replace amplifier |
| SP9019 | U-phase Current Offset | 19 | Current detection circuit abnormal | Replace amplifier |
| SP9020 | V-phase Current Offset | 20 | Current detection circuit abnormal | Replace amplifier |
| SP9021 | Position Sensor Polarity Error | 21 | Incorrect parameter setting | Adjust parameters |
| SP9022 | Overcurrent | 22 | Excessive load current | Reduce load, check environment |
| SP9024 | Serial Communication Error | 24 | Communication failure or cable issue | Replace cable, avoid interference |
4) SP9027 – SP9033
| Alarm Code | Message | Amplifier Display | Cause | Troubleshooting |
|---|---|---|---|---|
| SP9027 | Encoder Disconnection | 27 | Encoder signal abnormal | Replace cable |
| SP9029 | Short-term Overload | 29 | Excessive load applied | Adjust load |
| SP9030 | Input Circuit Overcurrent | 30 | Power supply overcurrent or imbalance | Check power |
| SP9031 | Motor Lock / Sensor Fault | 31 | Motor cannot rotate properly | Check load, replace cable |
| SP9032 | Serial LSI RAM Error | 32 | Internal circuit abnormal | Replace amplifier |
| SP9033 | DC LINK Charge Failure | 33 | Insufficient DC charge due to power issue | Check voltage or replace power unit |
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Reference Source: Beijing FANUC. This article is based on technical documentation provided by Beijing FANUC.
For More Fanuc CNC repair Cases and technical articles, please back to Fanuc Technical Support Center.
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