JLG 1850SJ, Service And Maintenance Manual, Page: 495 / 712

SECTION 6 - JLG CONTROL SYSTEM
3121619 6-63
11. The controller will disable telescope out, enable tele-
scope in and display “CAL POSITION 6” on the first line
and “TELE IN TO STOP”. The controller will monitor the
length sensor reading at which the length limit switch is
tripped. The switch should change state at 553 +3.5”/-
5.5”. If the switch changes state in the wrong length
range for the selected model, “CAL FAILED” and “CHECK
MODEL” will be displayed. If the switch does not change
state at all, the calibration should be aborted and “CAL
FAILED” and “LENGTH SW FAILED” will be displayed.
The length sensor reading at the precise switch trip
point will be recorded for operational length calibration
checks each time the boom passes through that point.
12. If no failures have occurred, the controller will enable lift
functions, disable telescope out functions and display
“CAL POSITION 7” on the first line and “LIFT DN TO
STOP”.
13. When operator presses ENTER controller will record
angle 7. The controller must see a moment reading less
than 50,000 lb-in, or “CAL FAILED” and “LIFT DN TO
STOP” will be displayed each time the ENTER key is
pressed and the moment reading is too high.
14. The Control system establishes the low angle calibration
point by taking into account ground slope in the direc-
tion of the boom. Low Angle Calibration value = -1.3° +/
- Ground Slope. If either of the angle sensors are not
within 10.0° of –39.3° (-1.3° - 38.0° = –39.3° equals rough
angle sensor mounting offset) then “CAL FAILED” and
“ANGL SNSR# FAULT” will be displayed.
15. The controller shall enable telescope out and display
“CAL POSITION 8” on the first line and “LIFT UNTIL STOP”.
The controller will disable Lift functions when the boom
angle reaches 0°. When the operator presses the ENTER
key, the controller will verify the measured angle is 0° +/
-1°. If not, The controller will display “CAL FAILED” and
“LIFT UP(DOWN) STOP” each time the ENTER key is
pressed and the angle does not match 0° +/-1°.
16. The controller shall display “CAL POSITION 9” on the first
line and “TELE TO YELLOW”. The swing function will be
enabled and the telescope functions will be disabled
when the measured length reaches 810.0” until the
function is cycled. While the boom is in this state the
telescope functions will be allowed to extend or retract
the boom 1.0” at a time. This can be repeated until the
length reading deviates from the expected witness mark
by more than +/-14”, when “CAL FAILED” and “LENGTH
FAILED” will be displayed. When the operator presses
the ENTER key, the controller will calculate and record
the 500# verification moment value. If this moment falls
outside the expected calibration moment value of
10.720E+06 lb-in, “CAL FAILED” and “MOMENT PIN
FAULT” will be displayed. The raw length sensor A/D
counts must between 5220 and 7220 counts or “CAL
FAILED” and “LEN SNSR FAULT” will be displayed.
17. The controller shall display “CAL POSITION 9” on the first
line and “JIB OUT TO STOP” on the second. When the
operator reaches the stopping point with the Jib and
presses enter, the controller will record the moment for
the 500# forward calibration. If this moment falls outside
the expected calibration moment range of 8.11E+06 to
10.81E+06 lb-in “CAL FAILED” and “MOMENT PIN FAULT”
shall be displayed.
18. The controller shall then display “CAL POSITION 10” on
the first line and “JIB IN TO STOP” on the second. When
the operator reaches the retracted position for the Jib,
the menu will automatically advance.
19. The controller will enable telescope in and display “CAL
POSITION 10” on the first line and “TELE IN TO GREEN”.
When Telescope In is commanded, boom length will be
controlled to 762.0” +/-0.5”.
20. When the operator presses the ENTER key, the controller
will verify the measured length matches the expected
green witness mark location, otherwise the controller
will display “CAL FAILED” and “TELE TO GREEN” each
time the ENTER key is pressed and the measured length
does not match the expected length. The controller will
calculate and record the 1000# forward calibration
moment and validate the moment is within the
expected range of 7.658E+06 to 10.21E+06 lb-in. If the
Moment is not in this range the controller shall display
“CAL FAILED” and “MOMENT PIN FAULT”. The controller
will also revalidate the length switch trip point using the
retracted and yellow witness mark to calculate length. If
the length switch trip point is not 553 +3.5”/-5.5”, the
controller shall display “CAL FAILED” and “LEN SNSR
FAULT”. Otherwise, the controller shall display “BOOM
SENSORS” on the first line and “CAL COMPLETE” on the
second line.