FANUC SV0411 – X AXIS EXCESS ERROR (MOVING) On the X-axis, this alarm means the deviation between commanded and actual position exceeded the limit during motion. X-Axis Specific Checklist Step What to check 1. Manual movement Power off and manually turn the X axis — check if it feels heavy/jammed (ball screw, linear guide, bearing) 2. Lubrication Check X axis way lube/greasing — dry guide rails increase friction and trigger this alarm 3. Servo amplifier Check the X axis servo amp LED/fault code 4. Motor & encoder cable Check if the X axis servo motor's power and feedback (encoder) cable connectors are tight 5. Coupling Check if the coupling between motor shaft and ball screw is loose or damaged (slipping causes encoder position mismatch)