Limit Switches - Genie S-105 Service Manual

Section 6 • Schematics

Limit Switches

Types of Limit Switches
There are two types of limit switches, which are
found in various locations throughout the machine:
mechanical-type operational or safety switches
and magnetic proximity switches. As in aircraft,
which features redundant safety systems, each
mechanical safety switch is backed up with an
independently functioning proximity 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 boom, position of the axles and
rotational position of the turntable.
For example, when the 53° operational switch is
activated by achieving a 53° boom angle, the boom
may then be extended beyond 75 feet (22.9 m).
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
'square' end of the drive chassis.
In some cases, the engine will be stopped if safety
parameters are exceeded.
Magnetic proximity switches are used to sense
very specific positions of a part of the machine in
relation to the remainder of the machine. Proximity
switches must be correctly aligned for the machine
functions to operate. Proximity switches are found
at the front and rear axle, the turntable and several
locations on the boom.
6 - 8
Limit Switch Numbering
LSAX1RO
LSAX2RO
LSAX1EO
LSAX2EO
LSAX1ES
LSAX2ES
LSB6S
LSB7DS
LSB3RS
LSB2RS ••
LSB9AS ••
LSB8AS
LSB4ES
LST1O
LSB1DO
LSB2RO ••
LSB3RO
LSB3EO
LSB4EO ••
LSB13AO
LSB14AO ••
LSB19LO
(•• S-120 and S-125 models only)
S-100 • S-105 • S-120 • S-125
Front axle retract proximity
Rear axle retract proximity
Front axle extend proximity
Rear axle extend proximity
Front axle extend safety
Rear axle extend safety
Cable tension safety
Boom 11° angle safety
Boom 3 foot (0.9 m) extend safety
Boom 101 feet (30.8 m) extend
safety
Boom 65° angle safety
Boom 50° angle safety
Boom 76 feet (23.2 m) extend
safety
Drive enable mechanical
Boom 10° mechanical
Boom >100 feet (30.5 m)
retract proximity
(changed to mechanical-
S-100/105- sn 160
S-120/125- sn 628)
Boom >3 feet (0.9 m) stowed
mechanical
Boom 75 feet (22.9 m)
extend proximity
(changed to mechanical-
S-100/105- sn 160
S-120/125- sn 628)
Boom 100 feet (30.5 m)
extend proximity
(changed to mechanical-
S-100/105- sn 160
S-120/125- sn 628)
Boom 53° angle proximity
Boom 68° angle proximity
Load moment mechanical
Part No. 102916
June 2011
REV A