SECTION 4 - MACHINE OPERATION
3121734
4-5
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 sec-
ond, the turntable/boom mounting is affected 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 either the tower or main
boom lift up or down during swing and drive commands to main-
tain a constant boom angle relative to gravity.
When the tower is below the tower transport angle and the main
boom is greater than 8° with respect to gravity, the angle of the
main boom is controlled. When the tower is above the tower
transport angle, the angle of the tower is controlled regardless of
main boom control select switch selection.
Controlled boom angle is disabled with any envelope violation or
fault and can be turned off with the manual position of the boom
control select switch.
Swing Speed Proportioning
Swing Speed Proportioning uses the envelope control sensors to
improve the comfort, speed and control of the turntable swing
function. Turntable swing speed is increased as the distance of
the platform to the center of rotation is decreased and when the
tower boom is lowered in angle. This results in approximately
constant platform speeds regardless of boom position.
Swing speed proportioning is disabled with any envelope sen-
sor’s fault. Disabling of swing speed proportioning will default to
the slowest swing speed setting.
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