JLG 80SL, Service Maintenance Manual

Page: 108 / 162

SECTION 5 - JLG CONTROL SYSTEM
5-2 – JLG Lift– 3121325
5.2 CONTROL CARD COMPLEX 2
General Description of Components and
Functions
The Complex 2 Control circuit board is an electronic
printed circuit board which processes the input signals
from the control console (and the joystick trigger switch
circuit board) and enables outputs to the rest of the
machine control system.
The circuit board is located on the lid of the Main Terminal
Box.
TP1 & TP2:
There are 2 potentiometers installed on the circuit card
indentified as TP1 and TP2 which adjust the creep speed
and the drive on/off ramp.
• TP1 - This is used to adjust the elevated creep speed
by modifying the analogue output voltage to the drive
control valve section. With the platform in an elevated
position (fast drive speed limit switch tripped) and
operating the machine with the console in the platform
position, adjust the TP1 potentiometer to obtain the
correct creep drive speed of 0.5 km/h.
• TP2 - This is used to adjust the ramp time to engage
and disengage the drive control valve section. With the
platform in the lowered position and operating the
machine with the console in the platform position,
adjust the TP2 potentiometer to obtain a drive acceler-
ation and deceleration to ensure smooth operation.
(nominal setting should be 2 seconds)
S1:
The connection S1 has not effect on the machine. (It’s
purpose, when removed, is to apply the ramp settings
from TP2 to the pump output signal.)
S2:
The connection S2 must be closed with a jumper plug to
enable the Lift and Lower output signals.
Figure 5-2. Control Card Complex 2 Board