Section
9. Theory of Operation
Toyota Orderpicker Model
15 Service Manual
proportional solenoid valve coil a t
indicated by the solenoid control
LED
on the
manager. The
proportional valve begins to
The lift button commands the carriage to lift.
ramp closed (this valve is normally open).
When the lift button is pressed, the
See Figure 9-8 on page 9-35.
proportional solenoid valve (normally open)
6. The lift
assembly is now
stays open while the lift contactor closes. After
running and supplying hydraulic pressure
the contactor closes and the lift pump motor
and flow to the lift cylinders.
t u r n s on, the proportional solenoid valve ramps
See Figure 9- 10.
closed which forces hydraulic fluid into the
cylinders and increases lift speed. The
proportional solenoid valve provides a smooth
transition between zero speed lift and full speed
lift and back to zero speed lift. When the lift
button is released, the proportional solenoid
opens and the lift contactor opens turning off
the lift pump motor. During lift, the load
holding solenoid valve remains closed
(de-energized)
.
The microprocessor on the
manager verifies the lift contactor remains
closed when commanded closed, and open
when commanded open. If either condition is
not met, the
manager generates a
fault code.
See Figure 9-9 on page 9-36. (The electrical
schematic legend is on page 9-2.)
1. As the control handle lift switch is closed,
a digital ground is applied to JPC13-6 on
the carriage manager.
2. The carriage manager sends a lift
command message to the
manager over the
lines.
3.
The
manager provides the
negative potential for the lift pump
contactor coil
18) and the pump
contactor coil is energized. The lift pump
contactor LED
on the
manager indicates the pump contactor coil
driver is energized. See Figure 9-8 on
page 9-35.
4.
When the lift pump contactor coil is
energized, the lift pump contactor tips
close supplying
to the lift pump motor.
5. The
manager provides the
negative potential for the
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5 March 2005
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