CP600 Pivot Operators Manual
OPERATION, SAFETY & MAINTENANCE
Section 1-31
© Pierce Corporation
July 2010
Troubleshooting
Machine St arts But End Tower Will Not Move
Running panel indicator light, Forward or Reverse
panel indicator light, and Safety panel indicator
light turn ON when Start switch is actuated and
STAY ON when Start switch is released. End Tower
panel indicator light never turns ON
1. Percent timer is set to 0%
2. Low pr essure switch tripped
3. Bad pressure switch
4. Bad percent timer
1. Move percent timer to desired setting
2. Check pressure switch setting and water
pressure at gage and lower pressure setting as
necessary. Check pressure switch wiring
3. Bypass pressure switch by moving water control
switch to Dry. If machines moves and pressure is
normal, replace pressure switch
4. Set percent timer to 100% and check for power
on Purple wire at terminal strip after one minute. If
no power on Purple, check for power at terminal 1
and terminal 2 of percent timer. If power is
present, check for power at terminal 3 of percent
timer. If no power is present, replace percent timer
Running panel indicator light, Forward or Reverse
panel indicator light, and Safety panel indicator
light turn ON when Start switch is actuated and
STAY ON when Start switch is released. End Tower
panel indicator light cycles ON and OFF with
Percent Timer
1. End tower is stuck
2. No power on End Tower (Purple) wire in end
tower box
3. Bad neutral at contactor in end tower box
4. Bad 480VAC connection at contactor i n end
tower box or a bad connection at motor
5. Motor thermal overload is tripped
6. Bad contactor in end tower box
7. Bad thermal overload or bad motor
1. Repair and maintain wheel ruts
2. Check for power on Purple in control panel. If
power is present, check for power on Purple in
each tower box. If no power is present, turn OFF
main disconnect and check collector ring wiring
3. Check neutral connection at contactor and
terminal strip in end tower box
4. Check Purple connection at contactor and
terminal strip in end tower box and check
connections at motor
5. Turn panel OFF and allow motor to cool , then
attempt to restart machine
6. Check for power across contactor coil. If power
is present and contactor does not pull in, replace
contactor
7. 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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