Appendix B: Troubleshooting Motion and Encoder Issues
Symptom or Error
Motor doesn't move
8. (cont) ..
If the wiring appears to be correct, disconnect the wires from
when commanded
the analog output for the axis in question at the GPIO4D, tighten the
terminals back down, issue the command again and measure at the
analog output signal again. If voltage no voltage is present, there is a
problem with the GPIO4D and it will need to be sent back in for repair. If
voltage is present with the wires removed, there is a problem with your
wiring or servo amplifier that is pulling down the signal from the GPIO4D
Symptom or Error
Motor jumps in one
1. Is the polarity of the analog output to the axis correct?
direction and CNC11
This symptom is often displayed when the polarity of the analog output
immediately displays a
from the GPIO4D is reversed or the encoder signal from the drive has
fault. (no oscillation)
the A & B channels reversed. To correct this, simply reverse the wires for
the analog input at the drive.
NOTE:
While this symptom is often confused with a tuning issue, it can
be easily differentiated by the fact that the motor “jumps” in only one
direction, only a single “bang” (if any) will be heard and a fault is
immediately reported by CNC11. Tuning issues are most often reflected
by the axis going into oscillations. (back and forth movements) and/or
rapid “banging” before faulting.
