JLG 1100S Service Manual - Manual (Page 154)

SECTION 4 - BOOM & PLATFORM
4-6 – JLG Lift – 3121256
Boom Control Select
The boom control select is controlled from the platform by
a switch mounted on the platform control panel. It allows
the operator the ability to select between two different
modes of boom control functionality: automatic and man-
ual. While in either mode, the Envelope Control System
and Moment Control System remains active.
When the boom control is selected to the automatic boom
control position, lift and telescope movements are coordi-
nated by the control system as described in the Con-
trolled Arc, Controlled Boom Angle, and Envelope
Tracking descriptions. These systems will remain active to
automatically assist the operator in keeping the boom
within the envelope boundaries.
When operating in the automatic mode, the following
functionality characteristics should be noted.
• While operating Lift Up, the boom may also telescope
out (Controlled Arc)
• While operating Lift Down, the boom may also tele-
scope in (Controlled Arc)
• While operating Swing or Drive, the boom may lift up or
lift down (Controlled Boom Angle)
• While operating Telescope In, the boom may lift down
when at high boom angles and the creep light is flash-
ing (Envelope Tracking)
In addition, when the boom control is selected to the auto-
matic position, the automatic platform leveling feature is
active during lift, telescope, swing, and drive movements
as described in the Electronic Platform Leveling System
description.
When the boom control is selected to the manual position,
lift and telescope movements are controlled separately by
the operator effectively turning off the controlled arc, con-
trolled boom angle, and envelope tracking systems. With-
out these systems being active, the control system will
stop the movements of the boom when the envelope
boundaries are reached and the functions that could vio-
late the envelope will be restricted. The platform alarm will
sound and the BCS light will flash with attempts to operate
a restricted function. In addition, when the boom control is
selected to the manual position, the automatic platform
leveling feature is active only during lift movements.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.