CP600 Pivot Operators Manual
OPERATION, SAFETY & MAINTENANCE
Section 1-30
© Pierce Corporation
July 2010
Troubleshooting
No control panel indicator lights turn ON when
Start switch is actuated
1. Main Disconnect is OFF
2. Blown 480VAC fuse
3. 120VAC circuit breaker in panel tripped or OFF
4. Bad Master Control Relay (RM) in control panel
1. Move Disconnect to ON position
2. When power is OFF, check and replace fuses as
necessary
3. Check circuit breaker in control panel
4. Ensure Master Relay is fully seated in socket.
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
Running panel indicator light and Forward or
Reverse panel indicator light turn ON only when
Start switch is actuated but Safety panel indicator
light does not. All panel indicator lights turn OFF
when Start switch is released
1. Bad tower alignment
2. Machine on barricade Safety (if barricades are
present)
3. Tower box power switch OFF
4. Low temperature switch tripped
5. Loose wire in Forward (Brown) circuit, Reverse
(Orange) circuit, or Safety (Yellow) circuit
6. Stall timer wired incorrectly
7. Bad stall timer
1. Check for tower misalignment. Realign machine
using Safety Override procedure as necessary
(improper use will Damage Machine)
2. Move direction switch to proper position to
move machine OFF barricade. Hold Safety Override
button and Start switch until machine moves off
barricade
3. Ensure every tower box power switch is in the
ON position
4. Check temperature switch set point and wiring.
Move Water Control switch to Dry to move
machine when temperature is low
5. With Disconnect off, check connections at
control panel terminal strip, in collector ring, and
in each tower box
6. Check stall timer wiring using wiring diagram in
Electrical section of manual
7. Replace stall timer
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