Service Manual Manual

SECTION 6 - JLG CONTROL SYSTEM
6-66 – JLG Lift – 3121171
6.18 BOOM CONTROL SYSTEM (BCS)
VIOLATION
NOTE: The Unlock Boom Calibration procedure must be
performed whenever the boom sensor calibration
procedure is completed.
The Boom Control System (BCS) will generate a fault
(“BCS VIOLATION – BOOM LOCKED”) when one of the
following faults become active;
• “TOWER LENGTH MOVEMENT WITHOUT COM-
MAND”
• “MAIN ANGLE MOVEMENT WITHOUT COM-
MAND”
• “TOWER CYLINDER ANGLE MOVEMENT WITH-
OUT COMMAND”
• “TOWER ENVELOPE MASSIVELY ENCROACHED”
• “TOWER ENVELOPE MULTIPLE ENCROACH-
MENTS”.
This fault will be stored in BCS memory and prevent Main
Telescope Out and Main Lift Up functions when that sec-
tion is out of Transport position and Lock the Boom into
Transport position once a section reaches transport posi-
tion. The fault will also cause the Ground and Platform
alarms to sound and illuminate the BCS Lamp.
To clear the “BCS VIOLATION – BOOM LOCKED” fault a
“UNLOCK BOOM” calibration procedure shall be used.
“UNLOCK BOOM” Calibration Procedure
To perform the Unlock Boom Calibration Procedure, these
initial conditions must be met:
• successful completion of Boom Sensors and Tilt
Sensor calibrations
• The Boom must be operating in the BCS Normal
Mode
• The “AXLE LOCKOUT VALVE – SHORT TO BAT-
TERY OR OPEN CIRCUIT FAULT” fault must not be
active
• The “OSCILLATING AXLE PRESSURE SWITCH
DISAGREEMENT” fault must not be active
• The “BRAKE – SHORT TO BATTERY” fault must
not be active
• the main boom must be fully retracted
• the main boom must be fully lowered
• the tower boom must be fully retracted
• the tower boom must be fully lowered
• the axles must be completely extended
• the machine indicates that it is not tilted
• the turntable is centered between the rear tires
• Ground Mode is selected
NOTE: During the calibration procedure, if the ESC key
is pressed after the procedure is started, the
calibration will be terminated and exit back to the
“UNLOCK BOOM” prompt.
NOTE: In the BCS state, Main envelope and Tower envelope
will continuously be monitored after the initial condi-
tions are satisfied. If at any time during the test the
BCS state is not Normal or the Main envelope or
Tower envelope indicated encroachment the Cali-
bration will terminate and the analyzer will display
“BCS VIOLATION”.
1. Using the analyzer, put the vehicle into Access Level
1 and enter the “UNLOCK BOOM” calibration. The
analyzer will display the following: