JLG 1500SJ Service Manual - Manual (Page 251)

SECTION 4 - BOOM & PLATFORM
3121262 – JLG Lift – 4-5
Boom Control System (BCS) Functional
Check (Push to Test) System
The machine is equipped with a system for the operator to
daily verify the proper functioning of the Boom Control
System (Envelope Control System and the Moment Con-
trol System). The operator is instructed to position the
boom in the position described by the instruction decal
and to then verify the control system cut out the telescope
movement at the correct length. When the operator
pushes the push button mounted on the ground control
panel, the control system compares the current moment
reading in the moment system and compares it to the
moment expected for this position. If the current moment
is within allowable tolerance for the test position, the
green BCS indicator will illuminate indicating the system is
working properly. If the current moment is not within the
allowable tolerance for the test position, the red BCS indi-
cator will illuminate indicating the machine requires ser-
vice by JLG authorized service personnel before the
system is used. Failure of this test will not restrict the func-
tionality of the machine and will not cause a system fault.
It is the operators responsibility to take proper action. The
machine can be in either capacity mode of the dual
capacity system for this system check.
4.2 BOOM/JIB SYSTEM FUNCTIONALITY
Main Lift/Jib Velocity Control
To improve the control of the main boom, platform level-
ing, and main lift/jib functions' end of stroke dampening,
the following angle sensors are utilized:
• Jib lift cylinder angle - CAN based in-cylinder length
sensor.
• Platform level cylinder angle - CAN based in-cylinder
length sensor.
• Jib level angle - Dual output analog angle sensor
whose signal is processed by the Jib Control Module.
• Jib rotate angle - Dual output analog angle sensor
whose signal is processed by the Jib Control Module.
• Main boom cylinder angle - Dual output analog angle
sensor (to be processed by the BLAM)
Jib Leveling During Automatic/Manual
Envelope Control
There are no function switches in the platform or ground
controls to manually adjust the jib level function. During
automatic or manual main lift control, jib level maintains its
angle in relation to the main boom position.
Jib Level Up/Down can be manually overriden using the
analyzer. The control system only allows this under certain
conditions and it should only be performed by an autho-
rized JLG service technician. When accessed, jib level can
be adjusted using the Jib Lift Up/Down function switch.
Jib Level override is accessible in Access Level 1. Using
the Left and Right arrow keys until the screen
shown below is reached.