Limit Switches And Angle Sensors - Genie Z80/60 Service Manual

Section 6 • Schematics

Limit Switches and Angle Sensors

Types of Limit Switches
There are two types of limit switches, found in
various locations throughout the machine:
mechanical-type operational or safety switches.
As in aircraft, which features redundant safety
systems, each mechanical operational switch is
backed up with a separate, independently
functioning safety switch.
The mechanical-type operational or safety
switches are used to sense a positive displacement
or movement of the limit switch actuator, or arm, as
the machine moves through its range of operational
functions. Included in this group are envelope limit
switches which sense the extended length and
angle of the booms and rotational position of the
turntable.
For example, when the secondary boom is fully
raised and the operational switch is activated, it
tells the ECM at the ground controls to start
extending the secondary boom.
Another example is the drive enable limit switch,
which disables the drive function anytime the boom
is rotated past the rear axles, indicated by the
'circle' end of the drive chassis.
In some cases, the engine will be stopped if safety
parameters are exceeded.
6 - 8
Limit Switch Numbering
LSP1AO Primary boom angle stowed
LSP1RO Primary boom length retracted
LSP1EO Primary boom length fully extended
LSS1AO Secondary boom angle, fully stowed
LSS2AO Secondary boom angle, fully raised
LSS3AO Secondary boom angle, 25° to 30°
LSS2AS Secondary boom angle safety
LSS1RO Secondary boom fully retracted
LSS1RS Secondary boom fully retracted, safety
LSJ1EO Platform level fully extended
LST1O Drive enable mechanical
LSA1OS Oscillate axle, right side
LSA2OS Oscillate axle, left side
Numbering Legend
J Jib boom
P Primary Boom
S Secondary Boom
T Turntable
LS Limit switch
LS P 1 R O
Z-80/60
June 2011
REV C
Switch number
D Down
A Angle
E Extend
R Retract
O Operational
S Safety
Part No. 88619