JLG 80SL Service Manual - Manual (Page 112)

SECTION 5 - JLG CONTROL SYSTEM
5-6 – JLG Lift– 3121325
• When the system completes the leveling process
(sensed angle is within 0.5° of set point in both axis),
the NIVOLUX system checks that all 4 outriggers have
ground contact and then powers up the lift valve.
NOTE: If ground contact is lost on any one of the 4 outrig-
gers, the lift function will be cut. In this event, the
platform should be fully lowered and the ground con-
ditions checked before attempting to re-level the
chassis.
• All the above operation is performed with the engine at
low idle speed. After the initial lift movement (a short
time delay), the high engine speed solenoid is ener-
gized to deliver the required oil capacity for normal lift-
ing operation.
• Above the Fast Speed Cutout Height (limit switch S
2.5m), the NIVOLUX Board cuts all output to the outrig-
ger valves. This ensures that no leveling function can
be performed with a raised platform.
• To retract the outriggers, it is necessary to maintain the
lowering function via the controller (joystick) after the
platform is in the fully lowered position. This position is
sensed by the limit switch (Platform Down) and the
NIVOLUX system automatically increases the engine
speed from low idle and powers up the 4 outrigger
retract valves.
• When all outriggers are retracted, the hydraulic system
pressure increases to the relief setting. This pressure is
sensed (at approximately 2683 psi (185 bar)) by a
pressure switch and signals the NIVOLUX system to re-
enable the drive function.
• This completes a full lifting cycle.
NIVOLUX Board LED’s
Setting and Adjustment of the NIVOLUX
Board
• Located on the circuit board is a potentiometer for
each axis ("Y" longitudinal and "X" lateral) to set a zero
point. There are three measuring points to accommo-
date a conventional voltmeter.
To Check and Set Adjustment:
1. Place the MEWP on an even, flat, and level surface.
Ensure the MEWP is level to within ±0.5° of 0°.
NOTE: The MEWP can be manually leveled by using the
outrigger handles on the main valve block (refer to
Figure 4-33., Main Valve Block). Lower outriggers by
engaging the handles until the machine is level to
within ±0.5° of 0° from front to back and right to left.
Check with a digital level gauge.
2. Ensure the Battery Disconnect is ON. Turn the select
switch to Platform and switch outriggers select to
Outriggers ON.
3. Power up the NIVOLUX board by switching the igni-
tion switch on the console to ON.
4. Open the MTB and measure the voltage between
the measuring points SOLL X/Y (supposed value)
and IST Y (actual value) which are the upper and
center measuring points. A voltage of +0.1V
(100mV) represents about 1° of inclination (nose
up). A value of -0.1V represents about 1° of inclina-
tion (nose down).
5. Adjust TP2 (see Figure 5-3.) with a small screwdriver
until your voltmeter shows zero. Turning counter-
clockwise reduces the value.
6. Measure the voltage between the measuring points
SOLL X/Y (supposed value) and IST X (actual
value) and follow the same steps as in step 5.
+0.1V represents an inclination of approximately 1°
to the right and -0.1V represents an inclination of
approximately 1° to the left.
7. Turn off the ignition switch and close the MTB. LED Meaning
Elevating the MEWP with outriggers selected:
Red LED N° 59 Level OK
Red LED N° 60 Leveling Finished
Red LED N° 58 Ground Bearing Pressure Reached
Red LED N° 61 Ground Bearing Pressure OK and Start
Lifting
After retracting the outriggers:
Green LED N° 66 All Outriggers Retracted
Elevating the MEWP with outriggers OFF:
Green LED N° 66 All Outriggers Retracted