SAFTRONICS
8
SYMPTOM PROBABLE CAUSE
Motor does not run
- No Run command.
- Speed reference at 0 volts.
- Blown fuses or no AC source.
AC line fuse/fuses blown
- SCR shorted.
- Field diodes shorted (D18).
- Grounded motor armature or
field.
Motor runs at slow speed with
the speed pot set fully cw.
- Max speed set too low.
- Drive in current limit.
- Tach feedback resistor
incorrect (if used).
- Bad speed pot.
Motor unstable.
- IR comp turned too high
- Voltage stability set
incorrectly.
- Current stability set
incorrectly.
- Max speed set too high.
- Fwd/Rev current limits set
differently.
Motor overspeeds with low
speed reference
- Max speed set too high.
- Tach input reversed (if used).
- No tach feedback if in tach
mode.
Motor drifts at zero speed -Adjust RV5 potentiometer.
5.0 TROUBLESHOOTING
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