JLG LSS Boom - Manual (Page 36)

SECTION 2 - SERVICE - ENGINE POWERED BOOM LIFTS
2-14 – JLG Lift – 3124287
Table 2-4. LSS Troubleshooting Chart - Host System Functionality
Difficulty Possible Resolution
The Visual and Audible Over-
load Warnings fail to sound
when platform is loaded
beyond Rated Load, or when
simulated by unplugging a
Shear Beam Load Cell from the
LSS Module. Controls remain
functional at Platform and
Ground Control positions. The Host Control System is failing to regard the overload signal from the LSS Module, or
the signal is shorted.
1. The Load Sensing System must be enabled within the Host Control System. Plug
the JLG Analyzer into the Host Control System, enter the Access Level 1 password
(33271), and examine the MACHINE SETUP, LOAD sub-menu. The selection
“2=CUTOUT PLT” should be displayed for European Community compliance (plat-
form controls prevented during overload, ground controls remain operational). In
country- or customer-specific circumstance, the selection “3=CUTOUT ALL” is used
(platform and ground controls prevented during overload).
2. The signal between the LSS Module and the Host Control System is shorted. The
Platform Module’s J1-20 is an input, and it connected to the J1-5 output on the LSS
Module To examine the status of this signal, plug the JLG Analyzer into the Host
Control System, enter the Access Level 1 password (33271), and examine the
DIAGNOSTICS, SYSTEM, LOAD display. The display will indicate “OK” when the
Platform Module’s input is energized (approximately 12V), and “OVERLOADED”
when it is de-energized (0V). Refer to the Wiring Diagram for Load Sensing System
for details
3. Observe the LSS Module’s assessment of overload using the JLG Analyzer plugged
into the LSS Module’s connection. Proceed to the DIAGNOSTICS, OVERLOADED?
display. The display should indicate “OVERLOADED? N” when the platform is
empty, and “OVERLOADED? Y” when the platform is overloaded. If the assessment
is improper, the difficulty may be a result of a General or Measurement Performance
issue. Review the Possible Resolutions under those categories.
4. If the LSS Module’s J1-5 Output does not appears to coincide with the DIAGNOS-
TICS, OVERLOADED? display, then the LSS Module is suspect. Substitute to deter-
mine cause of failure.
The Visual and Audible Over-
load Warnings sound even
when the platform is empty.
Controls are prevented in the
same manner as when over-
loaded. The LSS Module is un-powered, un-calibrated, or is experiencing a Measurement Perfor-
mance difficulty. Alternately, the Host Control System is not receiving the proper signal from
the LSS Module.
1. Ensure that the LSS Module is powered. The LSS Module’s LED will be lit or flash if
the module is powered. If not, ensure that approximately 12V is present between J1-
1 and J1-2 on the LSS Module (J1-1 is positive). Trace the Ignition and Ground sup-
ply wires into the Platform Console Box’s Wiring Harness using the Wiring Diagram
to locate the difficulty.
2. Plug a JLG Analyzer into the LSS Module’s connection and ensure that the Host
Control System is powered-up. When HELP:PRESS ENTER is displayed, press the
ENTER key on the Analyzer. If “EVERYTHING OK” is displayed, it is probable that
the Overload Signal from the LSS Module is not reaching the Host Control System.
This signal is present on LSS Module’s J1-5 and is approximately 12V normally, and
0V during an overload. This signal eventually reaches the Platform Module’s J1-20.
Refer to the Wiring Diagram for wire color, number, and terminal information.
3. If the Analyzer displayed “OVERLOADED” in the previous step, press the ENTER
key again. If “NO CAL” is displayed, the Load Sensing System has not been prop-
erly calibrated. Refer to the Calibration portion of this manual.
4. If another fault is displayed, refer to the portion of this manual that describes Fault
Messages and their causes.
5. The difficulty may be a result of a Measurement Performance issue. Review the Pos-
sible Resolutions under those categories.