Motor Lock Alarm

What does SP0031 mean?

The spindle motor is detected to be in a locked or stalled condition, preventing rotation. This can be due to excessive mechanical load, a brake issue, or a fault in the motor itself.

• Spindle motor is mechanically jammed or seized.
• Excessive cutting forces are preventing rotation.
• Amplifier command signal is not reaching the motor.
• Low voltage supply to the motor windings.

Click steps to track your progress.

1. 1

   Manually rotate spindle shaft to check for free movement.

2. 2

   Measure motor terminal voltages (U, V, W) when commanded to run.

3. 3

   Inspect spindle bearing for seizure or damage.

4. 4

   Verify amplifier output stage is functional (e.g., by checking for abnormal heat).