Service Manual Instruction 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 per-
formed whenever the boom sensor calibration procedure is
completed.
The Boom Control System (BCS) will generate a fault (“BCS VIO-
LATION – BOOM LOCKED”) when one of the following faults
become active;
• “TOWER LENGTH MOVEMENT WITHOUT COMMAND”
• “MAIN ANGLE MOVEMENT WITHOUT COMMAND”
• “TOWER CYLINDER ANGLE MOVEMENT WITHOUT
COMMAND”
• “TOWER ENVELOPE MASSIVELY ENCROACHED”
• “TOWER ENVELOPE MULTIPLE ENCROACHMENTS”.
This fault will be stored in BCS memory and prevent Main Tele-
scope Out and Main Lift Up functions when that section is out
of Transport position and Lock the Boom into Transport posi-
tion once a section reaches transport position. The fault will
also cause the Ground and Platform alarms to sound and illu-
minate 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 ini-
tial 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 BATTERY OR
OPEN CIRCUIT FAULT” fault must not be active
• The “OSCILLATING AXLE PRESSURE SWITCH DISAGREE-
MENT” 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 conditions 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 Calibration will terminate and the ana-
lyzer 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: