FANUC SP9007 alarm 07 usually means the spindle motor speed has exceeded about 115% of the maximum speed. The main checks are spindle motor parameters, spindle motor initialization, power line phase sequence, spindle detector, ladder logic during spindle synchronization, and finally the spindle amplifier.
For this alarm, do not replace the spindle amplifier first. Start by checking the spindle motor model, motor code, parameter setting, and power line phase sequence. SP9007 is often related to incorrect motor parameters, wrong phase sequence, abnormal spindle detector feedback, or spindle synchronization control issues.
What Does FANUC SP9007 Alarm 07 Mean?
FANUC SP9007 is an overspeed alarm. It means the spindle amplifier has detected that the spindle motor speed exceeded the allowed maximum speed range. Under standard parameter settings, this alarm is triggered when the motor speed exceeds about 115% of the maximum speed.
This alarm is mainly related to spindle motor parameter setting, spindle motor feedback detection, power line phase sequence, spindle synchronization control, or the spindle amplifier itself.
Main Alarm Information
| Alarm | FANUC SP9007 |
| Amplifier Alarm Number | 07 |
| Alarm Meaning | Spindle motor overspeed |
| Trigger Condition | Motor speed exceeds about 115% of the maximum speed |
| Main Related Parts | Spindle motor, power cable, spindle detector, ladder program, spindle amplifier |
Common Causes of SP9007 Alarm
- Incorrect spindle motor code or motor parameter setting
- Spindle motor parameters not initialized correctly
- Incorrect spindle power line phase sequence
- Abnormal spindle motor detector feedback
- Spindle synchronization control issue in the ladder program
- Position error accumulated during spindle synchronization
- Spindle amplifier speed detection or control circuit fault
Recommended Troubleshooting Order
- Check the spindle motor model and motor code.
- Confirm or reinitialize the spindle motor parameters.
- Check spindle-related parameters according to the motor specification.
- Check the spindle power line phase sequence.
- Check whether the alarm occurs during spindle synchronization.
- Inspect the spindle motor detector and feedback signal.
- Replace or repair the spindle amplifier only after the above checks are completed.
Step 1: Check Spindle Motor Parameters
First, confirm the spindle motor model and spindle motor code. Then check whether the spindle motor inherent parameters and spindle-related parameters are set correctly.
If the motor code or parameters are incorrect, the spindle amplifier may calculate speed feedback incorrectly and trigger SP9007 overspeed alarm. You can refer to the FANUC spindle motor parameter manual, such as B-65280CM, to confirm the correct motor parameter settings.
If the alarm appeared after parameter loss, CNC memory replacement, spindle amplifier replacement, motor replacement, or system recovery, reinitialize the spindle motor parameters and test again.
Step 2: Check the Spindle Power Line Phase Sequence
Check whether the spindle motor power line phase sequence is connected correctly. Incorrect phase sequence may cause abnormal motor rotation, unstable speed control, or overspeed detection.
Confirm the spindle motor power cable connection according to the original wiring marks and machine electrical diagram. If the cable was recently removed, replaced, repaired, or reconnected, the phase sequence should be checked carefully.
Step 3: Check Spindle Synchronization and Ladder Logic
If SP9007 occurs during spindle synchronization, check the ladder program and spindle synchronization control logic.
During spindle synchronization, if one side of the motor excitation signal, such as SFR or SRV, is turned off and then turned on again, the system may try to eliminate the accumulated position error during that period. In some cases, the spindle motor may accelerate quickly and reach the maximum speed, causing SP9007 alarm.
If this situation occurs, check and correct the ladder program related to spindle synchronization, excitation control, and position error handling.
Step 4: Check the Spindle Motor Detector
Check whether the spindle motor detector is working normally. Abnormal speed feedback may cause the amplifier to detect an overspeed condition even if the actual machine speed seems normal.
Check the detector connector, feedback cable, signal condition, and possible contamination or cable damage. If necessary, replace the spindle motor detector with a known good one for testing.
Step 5: Check the Spindle Amplifier
After confirming that the spindle motor parameters, power line phase sequence, spindle synchronization logic, and spindle detector are normal, check the spindle amplifier.
If all external checks are normal but SP9007 still occurs, the spindle amplifier speed detection or control circuit may be faulty. In this case, the spindle amplifier may need to be repaired or replaced.
SP9007 Diagnostic Table
| Finding | Possible Cause | Action |
| Alarm appears after parameter loss or part replacement | Incorrect spindle motor parameters | Check motor code and reinitialize parameters |
| Alarm appears after motor wiring work | Incorrect power line phase sequence | Check and correct spindle motor power line connection |
| Alarm appears during spindle synchronization | Ladder logic or synchronization control issue | Check SFR/SRV control and position error handling |
| Speed feedback is unstable | Spindle motor detector or feedback cable fault | Check detector and replace if necessary |
| All external checks are normal | Spindle amplifier fault | Repair or replace the spindle amplifier |
Parts Related to FANUC SP9007 Alarm
- FANUC spindle motor
- Spindle motor power cable
- Spindle motor detector
- Spindle feedback cable
- FANUC spindle amplifier
- CNC memory or parameter-related parts if parameters were lost
Important Notes Before Replacing Parts
Do not replace the spindle amplifier immediately without checking the spindle motor parameters and power line phase sequence. SP9007 may be caused by parameter errors, wrong wiring phase sequence, spindle detector feedback problems, or spindle synchronization logic.
Before replacing any part, record the spindle motor model, spindle amplifier model, CNC system model, alarm screen, parameter status, and whether the alarm occurs during spindle startup, acceleration, or synchronization. This information can help identify whether the fault is caused by parameters, wiring, detector feedback, ladder logic, or amplifier hardware.
Need Help with FANUC SP9007 Alarm?
REACO CNC provides technical support for FANUC spindle alarms, spindle amplifier repair, spindle motor troubleshooting, detector replacement, feedback cable replacement, and FANUC CNC spare parts supply. If your machine shows SP9007 alarm 07, our team can help you check the possible cause and recommend the right repair or replacement solution.
You can contact REACO CNC and send us photos of the spindle amplifier nameplate, spindle motor nameplate, CNC system model, alarm screen, motor power cable connection, and detector connector. We can help confirm whether the problem is more likely related to parameter setting, wiring, spindle detector feedback, ladder control, or spindle amplifier failure.
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