1. Intermediate tower is stuck
2. Alignment or micro-switch out of adjustment in
tower box
3. Bad neutral at contactor in tower that will not
move
4. Bad 480VAC connection at contactor in tower
box or a bad connection at motor
5. Motor th ermal overload is tripped
6. Bad micro-switch in tower box
7. Bad contactor in tower box
8. Bad thermal overload or bad motor
1. Repair and maintain wheel ruts
2. If machine is straight, ensure Run micro-switch
(Orange and Brown wires) arm is at center of travel
in each direction and that it clicks near the center
of travel. Adjust alignment arm and micro-switch
as necessary
3. Check neutral connection at contactor and
terminal strip in intermediate tower box
4. Check connection at contactor and terminal strip
in intermediate tower box and check connections
at motor
5. Turn panel OFF and allow motor to cool , then
attempt to restart machine
6. If power is present at COM of Run micro-switch
but not at NC (Brown) when micro-switch is not
actuated or NO (Orange) when micro-switch is
actuated, replace micro-switch
7. Check for power across contactor coil. If power
is present and contactor does not pull in, replace
contactor
8. With main disconnect OFF, check resistance of
each leg of 480VAC at motor to ground. If
continuity to ground is present, replace motor.
Check resistance between 480VAC leg 1 and leg 2,
leg 2 and leg 3, and leg 1 and leg 3. If one leg is
open or shorted, replace motor. If all legs are
open, thermal overload is tripped or damaged
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