Genie Z-51/30 Service Manual page 355

First Edition • Second Printing
2 Open the platform control box lid and locate
the turntable rotation controller. Refer to the
platform control box illustration, page 7-2.
a b c d
a ramp rate adjustable trimpot
b lo range adjustable trimpot
c terminal "R" (not used)
d (not used)
e terminal "X" (not used)
f terminal "-" ground
g terminal "+" positive
h terminal "A" proportional output
i threshold adjustable trimpot
j hi range adjustable trimpot
3 Set the preliminary ramp rate: Turn the ramp
rate trimpot adjustment screw counterclockwise
15 turns or until you hear a repeated click.
4 Connect the red (+) lead from a volt meter to
the "A" terminal on the controller printed circuit
board. Connect the black (-) lead to ground.
5 Set the threshold: Press down the foot switch,
then slowly move the control handle off center
until the moment a voltage reading appears.
Adjust the voltage to 2.85V DC. Turn the
threshold trimpot adjustment screw clockwise to
increase the voltage or counterclockwise
to decrease the voltage.
Part No. 52709
e f g h i j
Genie Z-45/25 & Genie Z-45/25J
Section 7 • Repair Procedures
6 Set the hi range: Press down the foot switch,
fully retract the boom, then move the control
handle all the way to the left or right. Adjust the
voltage to 5.5V DC. Turn the hi range trimpot
adjustment screw clockwise to increase the
voltage or counterclockwise to decrease the
voltage.
7 Start the engine and move the engine idle
control switch to foot switch activated high idle
(rabbit and foot switch symbol). Rotate the
turntable to the
FULL RIGHT
8 Start a timer and record how long it takes the
turntable to rotate to the
Adjust the max-out trimpot to achieve a 73 to 78
second cycle time. Turn the hi range trimpot
adjustment screw clockwise to increase the
speed or counterclockwise to decrease the
speed.
9 Set the ramp rate: turn the ramp rate trimpot to
obtain a 3 to 4 second ramp speed. Turn the
trimpot clockwise to increase the time or
counterclockwise to decrease the time.
Turntable rotation specifications
Threshold
Turntable rotation -
hi range
Cycle time
Ramp rate
PLATFORM CONTROLS
position.
position.
FULL LEFT
2.85V DC
5.5V DC
73 to 78 seconds
5 seconds
7 - 7