CP600 Pivot Operators Manual
OPERATION, SAFETY & MAINTENANCE
Section 1-33
© Pierce Corporation
July 2010
Troubleshooting
Machine Runs In Forw ard But Not In Reverse
Machine runs in Forward only
1. Bad neutral at end tower relay coil in end tower
box
2. No power on Reverse (Orange) wire at end
tower relay coil
3. End tower relay not fully seated in relay base in
end tower box
4. Bad end tower relay
1. Check neutral connection at end tower relay and
terminal strip in end tower box
2. Check for power across end tower relay coil
while attempting to start machine. If no power is
present, check for loose connections or improper
wiring of Reverse (Orange) circuit at control panel,
in collector ring, and in each tower box
3. Ensure end tower relay is fully seated in relay
base
4. Check resistance of relay coil between A1 and
A2. If coil circuit is open or resistance is zero,
replace relay. Proper resistance is ~1.8 ohms
Machine St arts and Runs In Both Directions But Shuts Down Intermittently
Intermittent machine shutdowns
1. Machine shut down due to a low temperature
condition (if low temperature switch is installed)
2. Machine shut down due to a stall condition
3. Machine shut down due to an alignment
problem
4. Loss of pressure for longer than the stall timer
setting when running in Wet
5. Loss of power to control panel during operation
6. Loose wire in Forward (Brown) circuit, Reverse
(Orange) circuit, or Safety (Yellow) circuit
7. Motor th ermal overload stopping a tower,
causing a stall or alignment safety shut down
1. Install temperature auto-restart option to
restart machine automatically if desired
2. If no tower is stuck, check stall timer wiring or
replace stall timer if faulty
3. Check for tower misalignment. Realign machine
using Safety Override procedure as necessary
(improper use will Damage Machine)
4. Install pressure auto-restart option to restart
machine automatically if desired
5. Install power auto-restart option to restart
machine automatically if desired
6. With Disconnect off, check connections at
control panel terminal strip, in collector ring, and
in each tower box
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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