JLG 740A, Service And Maintenance Manual

Page: 282 / 408

SECTION 4 - BOOM & PLATFORM
4-66 – JLG Lift – 3121160
Out of Usable Range Message
8/1 UMS SENSOR OUT OF USABLE RANGE
When both the Chassis tilt sensor and the UMS sensor
read greater than 10

in the same direction the UMS will
be disengaged until the condition no longer exists and a
fault shall be raised.
Solution:
• Verify the message clears when operating the machine
on grade less than 10

.
• Inspect sensor mounting.
• Verify sensor calibration on level pad.
UMS Sensor Not Calibrated Message
8/1 UMS SENSOR NOT CALIBRATED
If the control system detects a sensor out of range condi-
tion or a not calibrated fault with the UMS angle sensor,
the control system shall report a fault and disable Tower
Lift Down and activate the ground boom malfunction indi-
cator lamp, upright tilted lamp and platform alarm continu-
ally
If the control system detects that the UMS angle sensor
has not been calibrated, the ground boom malfunction
lamp will flash at a 3 Hz rate until the system is calibrated
or disabled.
Solution:
• Calibrate sensor.
UMS Sensor Faulted Message
8/1 UMS SENSOR FAULTED
If the system detects that the UMS sensor frequency out-
side the 100Hz +/- 5Hz range or the duty cycle is outside
50% +/- 21% range the control system shall report a fault.
Solution:
• Inspect wire harness going to the sensor and UMS
module.
• Inspect sensor mounting.
• Replace sensor.
Incompatible Software Detected Message
9/9 INCOMPATIBLE SOFTWARE DETECTED
If the control system detects that the ground module soft-
ware is incompatible with the UMS module, the UMS mod-
ule shall report a fault and disable the footswitch signal to
the ground module.
Solution:
• Update ground module software.
Calibration Faults
CAL FAILED-CHASSIS NOT LEVEL
The control system shall display a fault in the event the
raw sensor output is greater than

5° for the chassis sen-
sor.
CAL FAILED-UMS SENSOR RAW OUTPUT OUT OF
RANGE
The control system shall display a fault in the event the
raw sensor output is greater then

5° for the UMS sensor.
CAL FAILED-CALIBRATION DISRUPTED
If calibration is disrupted, the control system shall display
this fault.
C A L FA I L E D - U M S S E N S O R M OV E M E N T N O T
DETECTED
The UMS angle has not detected the required amount of
movement during calibration.