Soft Phase Alarm
Fanuc · Macro B CNC Programming
What does SP0134 mean?
An abnormal acceleration rate was detected in the spindle motor. This alarm indicates that the spindle experienced an unexpected or excessive acceleration, which could be due to a mechanical issue, an incorrect control parameter, or a faulty feedback system.
Common Causes
- DC link voltage is excessively high (above P1-01 threshold).
- Over-voltage during regeneration or grid disturbance.
- Faulty DC link capacitors.
- Braking resistor not activating or is undersized.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check for any mechanical binding, excessive load, or obstructions on the spindle motor that could induce abnormal acceleration.
- 2
Verify the spindle motor's acceleration/deceleration parameters in the control system, ensuring they are set within the motor's operational limits.
- 3
Monitor the spindle's actual speed and acceleration data via the control system to pinpoint the conditions under which the abnormal acceleration occurs.
- 4
Ensure the motor's position and speed feedback system (sensor and cable) is providing accurate data, as incorrect feedback can trigger this alarm.
- 5
If no mechanical or parameter issues are identified, consider a potential fault in the spindle amplifier's control logic or the motor itself, requiring further diagnosis or replacement.