JLG 800A_AJ Service Manual - Manual (Page 257)

SECTION 4 - BOOM & PLATFORM
3120858 – JLG Lift – 4-43
4.14 DRIVE CARD SETUP PROCEDURES
Lift, Swing, and Drive Cards
1. Center the input potentiometers. Power up the card,
but do not start the engine. Place the common lead
of a voltmeter on pin #6 and place the other lead on
pin #8. Rotate the potentiometer, leaving the joy-
stick in the center position, until the voltmeter reads
2.5 volts. Secure the set screw on the potentiometer.
When the potentiometer is centered and the joystick
is in the center position, LED #3 should not be illu-
minated.
2. Install test harness JLG P/N 4922012.
3. Set the minimum and maximum currents. The input
potentiometer must be centered before continuing
with this procedure. Power up the card, but do not
start the engine. Place the current meter in series
with the “A” output. Turn P3 counter clockwise until
the adjustment potentiometer starts to click. This will
set to maximum current to its lowest value. Move the
joystick until LED #3 illuminates and hold the stick in
this position. Adjust P4 until the meter equals the
current setting range given in Table 4-2. Rotating the
adjustment potentiometer clockwise will increase
the current. This will set the minimum current setting
for the “A” output. To set the maximum current for the
“A” output, hold the joystick in its maximum position.
Turn P3 clockwise until the meter reading equals the
setting in Table 4-2. Follow the same procedure for
the “B” output. Use P8 for the minimum current
adjustment and P7 for the maximum current adjust-
ment.
4. Set the ramp up and the ramp down times. Step 2
must be performed before continuing with proce-
dure. Power up the card, but do not start the engine.
Place the current meter in series with the “A” output.
Move the joystick from the center position to the
extreme position. Watch the meter for the time it
takes the output to go to from 0 current to maximum
current. This is the ramp up time. Adjust P1 until this
time matches the time given in Table 4-3. Rotating
the adjustment potentiometer clockwise will
increase the ramp time. To set the ramp down time,
hold the joystick in the extreme position. Release the
joystick and watch the meter for the time it takes the
output to go from the maximum current setting to 0
current. Adjust P2 until this time matches the time in
Table 4-3. Rotating the adjustment potentiometer
clockwise will increase the ramp time. Follow the
same procedure for the “B” output. Use P5 for the
ramp up adjustment and P6 for the ramp down
adjustment.
Flow Control Card
1. Set the input potentiometer. Power up the card, but
do not start the engine. Place the common lead of a
voltmeter on pin #15 and place the other lead on pin
#8. Rotate the potentiometer and verify the input to
the card is 3.8 volts when the input potentiometer is
in its minimum position. Rotate the input potentiom-
eter to its maximum position and verify the input to
the card is 0 volts.
2. Set the minimum and maximum current settings.
The input potentiometer must function properly
before continuing with this procedure. Turn P3 coun-
ter clockwise until the adjustment pot starts clicking.
Place a current meter in series with the “A” output.
Rotate the input potentiometer to its minimum set-
ting and operate the telescope function. Adjust P4
until the meter reading matches the setting in Table
4-2. This sets the minimum current setting for the
card. Rotate the input potentiometer to its extreme
position and operate the telescope function. Turn P3
clockwise until the meter reading matches the set-
ting in Table 4-2. This sets the maximum current for
the card.