JLG 740AJ, Руководство по обслуживанию и ремонту

Страница: 319 / 582

SECTION 4 - BOO M & PLATFOR M
3121160 4-47
4.15 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 joystick 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 cen-
ter position, LED #3 should not be illuminated.
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, Ramp Current Setting Range. Rotat-
ing 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 posi-
tion. Turn P3 clockwise 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.
4. Set the ramp up and the ramp down times. Step 2 must
be performed before continuing with procedure. Power
up the card, but do not start the engine. Place the cur-
rent meter in series with the “A” output. Move the joy-
stick 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 maximum
current setting to 0 current. Adjust P2 until this time
matches the time in Table 4-3, Ramp time Setting. Rotat-
ing 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 volt-
meter 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 potentiometer 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 con-
tinuing with this procedure. Turn P3 counter clockwise
until the adjustment pot starts clicking. Place a current
meter in series with the “A” output. Rotate the input
potentiometer to its minimum setting 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 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 setting in
Table 4-2, Ramp Current Setting Range. This sets the
maximum 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 cur-
rent. This is ramp up time. Adjust P1 until this time
matches the time in Table 4-3, Ramp time Setting. Rotat-
ing 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 clock-
wise will increase the ramp time.