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Table (cont'd)
SYMPTOM
CORRECTIVE ACTION
Motor produces
1. No Step pulses out - Check that there is a final speed command
torque, but does
voltage at the VCO monitor test point (VCO_INPUT_MON)
not run.
and the step pulses output (STEP_OUT) is switching.
Also verify that E1 and E3 jumpers are set correctly.
2. Loss of phase current in one winding. Check phase current in
both phases by placing an ammeter in series with each winding.
If not present, check for open circuit in motor phase winding by
measuring resistance.
3. One motor phase not wired correctly at stepping motor.
Check stepping motor wiring.
4. Step pulses output (STEP_OUT) is too high. Lower step pulses
output by adjusting Run Speed and Accel/Decel Potentiometers.
Also check to make sure that the step size and frequency range
jumper (E2) are set correctly.
Motor misses
Incorrect run speed or low speed. Adjust run speed potentiometer
steps.
or low speed potentiometer.
Incorrect accel ramp time or decel time. Adjust accel
potentiometer or decel potentiometer.
4 - 4
6415 Installation and Hardware Reference Manual - Rev E
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