CP600 Pivot Operators Manual
OPERATION, SAFETY & MAINTENANCE
Section 1-36
© Pierce Corporation
July 2010
Booster pump will not start
1. Pressure switch in booster pump box is
improperly adjusted
2. Booster pump contactor not pulling in
3. Booster pump overload is tripped
1. Lower pressure switch setting until booster
pump starts
2. Check for power across contactor coil. If power
is present and contactor does not pull in, replace
contactor. If no power is present but end gun is ON
and there is power at end gun solenoid valve in
end tower box, check End Gun (Pink) circuit in
booster pump box and end tower box
3. Check overload in junction box and reset if
necessary. If overload continues to trip, turn 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
Booster pump runs but pressure is not being
boosted
1. Booster pump motor is rotating ba ckwards
1. With main disconnect OFF, reverse any two l egs
of 480VAC at motor or at the booster pump
contactor
Machine runs in Forward (clockwise) direction with
switch in REV or runs in Reverse direction with
switch in FWD
1. Phase reversal of the incoming 480VAC power
1. With main disconnect OFF, reverse any two legs
of 480VAC at bottom of FWD/REV contactor in the
control panel
A tower or towers move in the opposite direction
of the r est of the towers
1. Phase reversal of the 480VAC power at the
offending motor or tower box contactor
1. Re-phase motors as necessary to obtain proper
direction of rotation
1. Short between the Forward (Brown) and
Reverse (Orange) circuits
1. Check for power on both the Forward and
Reverse circuits at the same time. If power is
present on Brown and Orange, turn off main
disconnect and check for short in control panel,
collector ring, and in each tower box
Troubleshooting
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