Problem: SPN1 motor lock or V-sig Los alarm
This type of alarm comes when there is single phasing in the spindle motor.
Remedy:
1. Check resistance of spindle motor should be balanced.
Example: Spindle motor resistance: -
RY-0.8 ohm,YB-0.8 ohm,BR-0.8 ohm.
3. Check input voltage of machine should be RY,YB & BR phase 200VAC.
In the picture above, the spindle motor wire is burnt due to SPN1 motor lock or V signal loss alarm occurred
