JLG 740AJ Service Manual - Manual (Page 260)

SECTION 4 - BOOM & PLATFORM
4-44 – JLG Lift – 3121160
4.14 DRIVE CARD SETUP PROCEDURES
Lift, Swing, and Drive Cards
5. 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.
6. Install test harness JLG P/N 4922012.
7. 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 inTable 4-2, Ramp Cur-
rent Setting Range. Rotating the adjustment potenti-
ometer 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 clock-
wise until the meter reading equals the setting in
Table 4-2, Ramp Current Setting Range. Follow the
same procedure for the “B” output. Use P8 for the
minimum current adjustment and P7 for the maxi-
mum current adjustment.
8. 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 inTable 4-3, Ramp time
Setting. 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 maxi-
mum current setting to 0 current. Adjust P2 until this
time matches the time in Table 4-3, Ramp time Set-
ting. Rotating the adjustment potentiometer clock-
wise 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, Ramp Current Setting Range. This sets the min-
imum 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 setting in Table 4-2,
Ramp Current Setting Range. This sets the maxi-
mum current for the card.
3. Set the ramp up and the down times. Step 2 must be
completed 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
the input potentiometer to its extreme position and
operate the telescope function. watch the meter for
the time it takes the output to go from 0 current to
maximum current. This is ramp up time. Adjust P1
until this time matches the time in Table 4-3, Ramp
time Setting. Rotating the adjustment potentiometer
clockwise will increase ramp time. To set the ramp
down time, hold the telescope function switch and
watch the time it takes the output to go from the
maximum current down to 0 current. This is the
ramp down time. Adjust P2 until this time matches
the setting time in Table 4-3, Ramp time Setting.
Rotating the adjustment potentiometer clockwise
will increase the ramp time.