C axis refers to the spindle drive and usually is related to the inverter having a fault or the orientation prox switch not switching during spindle rotation.
I guess I would have to know what fault number is reported by the control to really have an idea what is happening for sure.
fadals are not too terribly sophisticated and error reporting is not the most in depth or comprehensive part of these controls. The error usually - but not always point you in the direction of the actual failure. In the case of an axis fault the axis reported as having failed could just be where the jog selector switch was set when the failure occured rather than the actual axis at fault and the red light on the amplifier in question is sometimes momentary so you have to catch the actual moment of failure to know which axis went- or see a standing error on the position display to the right of the axis position in question.
With no motion, error values would normally be "0" rolling +/- 1 or 2 counts if everything is normal and the drives up. if the axis is in a bind or "lost" the error value will go up +/- from 0 and will fault the machine when too large a value is seen by thhe control. the only way to recover when this happens is to power down and restart the control.  |