Upright LX31, Service Manual

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4-14 LX31/41 Electric Work Platform
T
R O U B L E S H O O T I N G
Section
4.9
4.9 ACTIVATING "TEST"
Position red LED at TEST. Press "+" or "-" to select
the switch to be viewed.
The zero position input "-" should read zero and is set
by adjusting the sensitivity threshold trim pot in the
upper control box. Step on the foot switch and keep-
ing the joystick centered, adjust the pot to give a
readout of 1 or 2. Slowly back the pot down until the
reading has just dropped to zero.
Connect voltmeter between B- and pin 14 on
MOS90. Voltage at pin 14 in neutral should not be
lower than +3.5 volts D.C. 3.5 VDC = 0% speed input,
0.0 VDC=100% speed input.
If set at an extremely high value MOS90 will read as
fault and shut down.
Properly set the LX31/41 should start to move slowly
with a small movement of the joystick after a very
small "deadband" zone.
Figure 4-2: MOS90 17 Way Connector Pinout Designation
MOS90
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Pump/Traction
Tachometer direction input from tach board (18 Volts = rev. & 0 Volts = FWD.
No connection
Height Limit
B side of direction & brake contactors for coil suppression (48 Volts)
+ 48 Volt supply to power up controller
Tilt
48 Volts when forward is selected & 0 Volts in neutral
No connection
No connection
48 Volts when reverse is selected & 0 Volts in neutral
Tach signal from tach gen. (7.5 Volts to 15 Volts = FWD. 0-100% and 7.5
Volts to 0 Volts = REV. 0-100%
High/Low Speed
Traction accelerator signal (3.5 Volts to 0 Volts = min. to max. speed)
Forward contactor driver - goes to battery negative to energize contactor
Brake applied input (48 Volts = brake on & 0 Volts = brake off)
Reverse contactor driver - goes to battery negative to energise contactor
Black
Brown
Red (spare)
Orange
Yellow
Green
Blue
Purple
Grey (spare)
White (spare)
Pink
White/Purple
White/Red
White/Black
White/Yellow
White/Blue
White/Green