JLG 1350SJP Service Manual - Manual (Page 238)

SECTION 4 - BOOM & PLATFORM
4-4 – JLG Lift – 3121142
position of the boom control select switch. Refer to Boom
C o n t r o l S e l e c t .
NOTE: For more detailed information concerning system adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
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
intentionally moving the boom. The controlled boom angle
system 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 failures. The con-
trolled 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 adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
Envelope Tracking
The Envelope Tracking System uses the envelope control sen-
sors to enhance the control of the boom within the working
envelope. Due to the shape of the working envelope, the max-
imum 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 violations or failures. The envelope tracking function-
ality 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 adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
Slow Down System
When the boom approaches the edges of the working enve-
lope, all functions (except jib and platform functions, tele-
scope 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 opera-
tor 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 operator this automatic introduction
of slow down by flashing the creep light on the platform dis-
play panel. This feature applies to both platform and ground
controls, however, no indication is made on the ground con-
trol panel.
NOTE: For more detailed information concerning system adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
Controlled Arc Boom
Movement