Boom Components; Boom Proximity Switch; How To Test A Proximity Switch - Genie GTH-1048 Service Manual

Service Manual

Boom Components

Boom Com ponent s
1-1 Boom Proximity Switc h
1-1

Boom Proximity Switch

The boom angle switch is a proximity switch. This
switch functions by sensing a change in the
electromagnetic field of the switch, due to the
introduction of metal into the field. A proximity
switch is, simply, a metal detector.
The switch generates an electromagnetic field at
the face of the switch. This field senses when steel
has been moved close to the switch as well as
when the steel has been moved away, which is
how the switch contacts open and close.
These switches are of a fail-safe design. Should
the switch or the switch wire circuit be faulty, the
machine will not function outside its designed
range of use.
The boom proximity switch is a component of the
drive circuit and the chassis sway circuit. Both the
drive and the chassis sway functions are disabled
when the boom is raised to 60° or higher.
48
How to T est a Pr oximity Switc h

How to Test a Proximity Switch

1 Remove the switch from the machine. Do not
disconnect the switch wire harness from the
machine.
2 Start the engine.
3 Move the switch away from any ferrous or
metallic object
Result: The light of the limit switch assembly
is not illuminated.
4 Move the switch close to any ferrous or
metallic object
Result: The light of the proximity switch
assembly turns on. The switch is functioning
correctly.
GTH-1048 • GTH-1056
March 2016
Part No. 123701
Courtesy of Crane.Market