JLG 723A Service Manual - Manual (Page 150)

Electrical System
9.42 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
9.15.3 LSI System Calibration
a. Standard Calibration
To calibrate the LSI, certain conditions must be met:
• The sensor must be installed according to Section
9.15.2, “LSI Sensor.”
• The machine control system must be powered on for
at least 10 minutes before calibration.
• The calibration shall be conducted with the standard
carriage and forks attached for the machine and
weights as necessary.
• The machine must be on a level surface with the
wheels steered straight, park brake OFF and ignition
turned ON.
• Access to the calibration mode requires the use of a
magnetic key.
Calibration procedure:
Calibration of the LSI requires the setting up of two
reference points, 0% and 100% Safe Work Load (SWL).
1. With the ignition key in ON position, press and hold
TEST button on LSI display. Place the magnetic key
in position; level with and just to the right of the
TEST button. The display will show all LEDs flashing
and buzzer on. The correct position is indicated
when the buzzer stops and all LEDs stay on.
2. The lower green LED of the scale should be on
constant. Position the machine with empty
attachment with boom level and fully retracted, forks
level (not contacting the ground).
3. Keep holding the TEST button and MAGNET in
place until the display changes to display the red
LED only. This indicates that the system is now in
the calibration mode and waiting for the first
reference point.
4. Release the TEST button and remove the MAGNET.
The display will emit short intermittent beeps to
remind the operator that the calibration is in
progress.
Note: If the TEST button or MAGNET is released to
early, the display will revert back to normal operation with
the previous calibration settings.
5. The system allows FIVE minutes for each part of the
calibration procedure to be completed. If a part of
the calibration procedure is not completed within the
FIVE minutes allowed, the system will revert to
normal operation with the previous calibration
settings.
6. If the ignition is switched OFF during calibration the
system will automatically revert to the previous
calibration settings.
7. Set 0% SWL- Position the machine on level ground
in the 0% calibration mode (boom fully retracted,
forks lowered but not resting on the ground and no
load on forks).
8. Press the TEST button once. The system will give a
single, short beep indicating that the 0% point is set.
The display will change to show the red and amber
LEDs lit (with continuing intermittent beeps),
indicating that the system is ready and waiting for
the 100% reference.
Note: If a long beep is emitted from the buzzer during
calibration, this indicates a fault condition (see Section b,
“Error Conditions.”).
9. Set 100% SWL- Pick up the calibrated (maximum
capacity)100% load and extend the boom to the pre-
determined, normal 100% point.
10. Press the TEST button once to set the 100%
reference. The display will now change back to
normal operation and show 100% (all green and
amber LEDs are lit and flashing).
11. Turn the ignition key to OFF. LSI is now calibrated.
b. Error Conditions
1. Sensor signal out of range - Red and 1st Green LED.
2. Calibration Error - Red and 2nd Green LED.
3. Display Circuit Fault - Red, 2nd and 3rd Green LED.
4. Calibration Required Error - Red and 3rd Green
LED.
c. Field Calibration
To calibrate the LSI, certain conditions must be met:
• The sensor must be installed according to Section
9.15.2, “LSI Sensor.”
• The test weight matches the model being calibrated
in the table shown below.
• The calibration shall be conducted with standard
carriage and forks attached to the machine.
• While utilizing the LSI override button, 10 times lift
and lower the boom stopping suddenly to induce the
rear axle to bounce.
Model Weight on Rear Axle
L2906, 2906H, 29.6LP & 29.6 650 kg (1433 lb)
3507H & 35.7 800 kg (1764 lb)