JLG 80SL Service Manual - Manual (Page 116)

SECTION 5 - JLG CONTROL SYSTEM
5-10 – JLG Lift– 3121325
• When the platform is below the maximum height, this
switch is closed. One contact passes a 24V signal to
the Control System (Complex 2 Board) to enable lift
up.
• The other contact passes 24V from Relay KT contacts
to the Ground control Lift Up Switch.
• When this switch is activated, the lift function is cut.
Tilt Switch
S Tilt Switch:
The scissor lift is equiped with a chassis inclination sensor
set to trip at 3°. The value of the incline will be monitored
by a tilt switch, which will cut off lifting, driving, and steer-
ing once the platform is raised (above High Drive Speed
Cutout Limit Switch (S 2.5m)) and the set angle is
reached. The lowering function remains available to bring
the platform below the High Drive Speed Cutout Limit
Switch (S 2.5m) height. This permits the drive function to
enable the MEWP to be repositioned on a level surface.
This multi axis tilt switch is mounted in the valve compart-
ment to sense the angle of the chassis. The Control Sys-
tem (Complex 2 Board) uses the input signal from the
High Drive Speed Cutout Limit Switch (S 2.5m) to bypass
this tilt switch.
• When the chassis is within the set point angle limits,
there is a constant output of 24V. The Control System
(Complex 2 Board) uses this signal to permit the lift up,
drive, and steering functions when the machine is ele-
vated (S 2.5m is cut).
When tilted beyond 3°, there is zero output and a red LED
on the console is turned on by means of relay KT. Also,
when S 2.5m Limit Switch is activated, the functions of lift,
drive, and steer are also cut.
Adjustment:
Place the machine on a flat level surface. Using a digital
level, ensure the chassis is level. Adjust the X and Y axis
nuts to place the top mounted bubble level in the center.
Oscillating Axle Limit Switches
A pair of switches are mounted on the oscillating axle and
sense the angle of the axle with respect to the frame.
These are wired in series with the S8m Limit Switch. The
S2.5m Limit Switch signal bypasses both switches.
• When the axle is within 1.5° of the frame, the switches
are closed and permit a 24V signal to the S8m Switch.
• When either of the switches are activated and Limit
Switch S2.5m is also activated, the drive function is
cut.
Outrigger Limit Switches
These 4 limit switches are mounted on the top (barrel end)
of each outrigger cylinder and work in conjunction with
the NIVOLUX Automatic Self-Leveling System. They are
utilized to sense when the outrigger pad makes ground
contact and are wired in series on both the normally open
(N.O.) and normally closed (N.C.) contacts.
• Refer to Section 5.3, Nivolux - Automatic Self-Leveling
System for a description of the operation.
Pressure Switch
A pressure switch is line mounted in the drive brake
hydraulic line. This pressure switch works in conjunction
with the NIVOLUX Automatic Self-Leveling System.
• Refer to Section 5.3, Nivolux - Automatic Self-Leveling
System for a description of the operation.
Table 5-11. Limit Switches
Switch Purpose
Outriggers
Jacks Selected = No switch input to X1/43 and N.C. contacts wired in series to sense ground contact
for all jacks then enable lift up by energizing relay K1.
Jacks Not Selected = Switch input to X1/43 and N.O. contacts wired in series to sense all jacks
retracted and enable lift up by energizing relay K1.
S Platform Down
N.C. contacts sense when platform is fully lowered. Enables jacks retract (select by resetting lift switch
when fully lowered and continue to lower) and re-enable drive function. Only when jacks are selected.
S 2.5m
N.C. contacts sense at +/- 12 ft (3.7m) platform height and interlock fast drive speed. Interlock drive
and lift if tilted (tilt switch tripped). Also indicates lift available LED at console.
S 8m
N.C. contacts sense max permitted drive height of the platform and interlocks drive function. Senses
max lift height when outriggers are not deployed. Also indicates lift available LED at console.
S Max Height
N.C. contacts sense max platform height and interlocks lift up. Also indicates lift available LED at con-
sole.