Limit Switches - Genie S-100 Service And Repair Manual

Section 5 • 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.
Numbering Legend
Circuit number
AX Axle
B Boom
T Turntable
LS Limit switch
LS AX 1 R O
5 - 8
D Down
A Angle
L Load moment
E Extend
O Operational
R Retract
S Safety
S-100 • S-105 • S-120 • S-125
Limit Switch Numbering
LSAX1RO Front axle retract proximity
LSAX2RO Rear axle retract proximity
LSAX1EO Front axle extend proximity
LSAX2EO Rear axle extend proximity
LSAX1ES Front axle extend safety
LSAX2ES Rear axle extend safety
LSB6S Cable tension safety
LSB7DS Boom 11° angle safety
LSB3RS Boom 3 foot (0.9 m) extend safety
LSB2RS •• Boom 101 feet (30.8 m) extend
safety
LSB9AS •• Boom 65° angle safety
LSB8AS Boom 50° angle safety
LSB4ES Boom 76 feet (23.2 m) extend
safety
LST1O Drive enable mechanical
LSB1DO Boom 10° mechanical
LSB2RO •• Boom >100 feet (30.5 m)
retract proximity
(changed to mechanical-
S-100/105- sn 160
S-120/125- sn 628)
LSB3RO Boom >3 feet (0.9 m) stowed
mechanical
LSB3EO Boom 75 feet (22.9 m)
extend proximity
(changed to mechanical-
S-100/105- sn 160
S-120/125- sn 628)
LSB4EO •• Boom 100 feet (30.5 m)
extend proximity
(changed to mechanical-
S-100/105- sn 160
S-120/125- sn 628)
LSB13AO Boom 53° angle proximity
LSB14AO •• Boom 68° angle proximity
LSB19LO Load moment mechanical
(•• S-120 and S-125 models only)
March 2017
Part No. 1268494