411 is following error.
Our M4 with a 5T control had the encoder in the motor. and a shear pin between the motor and Z axis lead screw.
Needless to say that when the shear pin broke, usually there was a large boring bar in the rear turret and a bad crash resulted.
My chronic complaining to Mazak service, about the bad design, maintaining that the encoder belonged on the lead screw coupled with the very nasty name I gave it, I was known by name in Japan, that was over 25 years ago. It appears that took my complaints seriously, because when we bought the Micro Slant, it had the X axis encoder on the lead screw so when the shear pin broke, it stopped running.
Since your problem is on X and not Z, you need to determine if the encoder will move if the motor turns, no broken shear pin, and that the axis is not seized (the motor is not able to turn when power is applied).
Does the motor try to turn? If not you may have a bad motor, check the brushes. Or a broken wire in the cable from the motor to the machine.
If the above checks don't reveal the problem. unhook the motor leads at the velocity control unit and apply 12 Volts DC and see if the motor will creep a bit. If it will, check the fuses on the velocity control unit. The alarm fuses detect a blown fuse. Many times the alarm contacts are bypassed and a blown fuse is not sensed, Those 1.3 Amp alarm fuses need to be in place if missing, that causes problems.
If the motor turns a little before the alarm 411 appears, look at the encoder and wiring. Frequently there is a flexible coupling driving the encoder, they break and can give you the problem you have. The encoder wiring may be bad or a bad encoder.
Hope this rambling reply can shed some light on things to look for.
Bill