Graham 176B1111, Instruction Manual

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TROUBLESHOOTING GUIDE
MOTOR WILL NOT RUN:
1 . Make sure power is applied to unit. If not, make sure
disconnect fuses or circuit breaker in line are okay.
2 . Make sure RUN switch is on (RUN (green) LED should be lit).
3 . Make sure INHIBIT connection is correct. (see page ).
4 . Be sure Speed Pot is not set to zero.
5 . Current Sense Resistor is not installed properly.
6 . Unit is in Current (torque) Limit. Check CL (yellow) LED (if lit,
this indicates that CL pot is set too low, or motor is
overloaded).
7 . With power removed from unit and motor leads disconnected,
check for worn or improperly seated brushes.
8 . Defective control.
FUSE BLOWING:
1 . Improper wiring - check wiring for misrouting, shorts, and
shorts to ground.
2 . Motor brushes worn or improperly seated.
3 . Motor load is too heavy. Check for machine “jamup”, or
excessive load.
4 . Defective control.
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