JLG 1100S Service Manual - Manual (Page 152)

SECTION 4 - BOOM & PLATFORM
4-4 – JLG Lift – 3121256
sor failure, any moment violation, any envelope violation,
or with auxiliary power functions. The controlled arc func-
tionality and be turned off using the manual position of the
boom control select switch. Refer to Boom Control Select.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Controlled Boom Angle System
The Controlled Boom Angle System uses the envelope
control sensors to enhance the control of the boom by
minimizing the interaction of swing and drive functions
with the envelope edges. This interaction is due to two
factors. First, the envelope is controlled relative to gravity
regardless of ground slope and second, the turntable/
boom mounting is effected by swing and drive functions
when the ground slope varies. This can cause the boom
position to vary within the envelope or even violate the
envelope edges when swinging or driving without inten-
tionally moving the boom. The controlled boom angle sys-
tem minimizes this effect by automatically introducing lift
up or down during swing and drive commands to maintain
a constant boom angle relative to gravity for all boom
angles greater than 9 degrees. Controlled boom angle is
disabled with any envelope or moment violations or fail-
ures. The controlled boom angle functionality and be
turned off using the manual position of the boom control
select switch. Refer to Boom Control Select.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Envelope Tracking
The Envelope Tracking System uses the envelope control
sensors to enhance the control of the boom within the
working envelope. Due to the shape of the working enve-
lope, the maximum boom angle varies with telescope
length. To maintain unrestricted operation of the boom,
the lift down function is automatically introduced while
telescoping in only when the boom is on the rearward
edge of the envelope. This only occurs when telescoping
in along the rearward edge and is not used elsewhere
within the envelope or when telescoping out. Envelope
tracking is disabled with any envelope or moment viola-
tions or failures. The envelope tracking functionality and
be turned off using the manual position of the boom con-
trol select switch. Refer to Boom Control Select.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Slow Down System
When the boom approaches the edges of the working
envelope, all functions (except jib and platform functions,
telescope in or out on the rearward edge and telescope in
on the forward edge) are automatically slowed down by
the control system to reduce the machine dynamics and
improve operator control. The slow down starts within 4
feet of all edges and is at the fully reduced speeds 2 feet
from all edges. The control system indicates to the opera-
tor this automatic introduction of slow down by flashing
the creep light on the platform display panel. This feature
applies to both platform and ground controls, however, no
indication is made on the ground control panel.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Controlled Arc Boom
Movement