JLG 1200SJP Operator Manual - Manual (Page 63)

SECTION 4 - MACHINE OPERATION
3121141 – JLG Lift – 4-3
Envelope Tracking
When the platform approaches the edges of the operating enve-
lope all machine functions are slowed down automatically by the
boom control system to reduce machine motions.
NOTE: Boom Control System in Automatic Mode: When the boom is
completely elevated along the edge of the backward stability
region and the telescope in function is activated, lift down will
automatically function until the boom is away from the edge of
the backward stability region.
Boom Control System in Manual Mode: The boom will stop when
the end of the envelope is reached and the operator must acti-
vate lift and/or telescope in the proper direction to bring the
boom back into the envelope.
Controlled Angle
The control system automatically maintains a constant elevated
boom angle when swinging the turntable. If the boom angle is at
30 degrees, swing engaged by its self shall add lift to maintain
the relative boom angle at 30 degrees.
Swing Speed Proportioning
The boom control system sensors sense the distance the platform
is extended from the turntable, allowing higher swing speeds
with the boom retracted and gradually slower swing speeds as
the boom is extended.
BUFFER LINE
ENVELOPE
SLOWDOWN LINE
BUFFER
ZONE
SLOWDOWN
ZONE