Data Sheet

Sensing and Productivity Solutions 21
MICRO SWITCH™ Global Limit Switches, GLA Series
Basic Switches
Plug-in EN50041 body style
The switch enclosure portion of this two-piece body style plugs
into a pre-wired terminal block mounted in the application.
Replacement is accomplished by unplugging the old switch
enclosure and plugging-in a new switch enclosure (basics are
permanently staked in the switch enclosure).
LED WIRING
The GLF, GLG, and GLH versions of GLS (EN 50041) come
complete with LED indicators. These indicators can be wired in a
variety of ways. Operation can indicate switch free or switch
operated depending on the wiring arrangement employed. The
table below indicates the body styles and indicators offered.
Table 12. LED Series
Body Function Specification
GLF 1 LED
12 Æ 250 Vac and dc less than 1.5 mA draw
GLG 1 LED plug-in
12 Æ 250 Vac and dc less than 1.5 mA draw
GLH 2 LED
18 Æ 30 Vdc 7 mA typ. current draw
The following wiring diagrams show possible configurations
that can be used for the LEDs. Combinations of these arrange-
ments can be used where the dual LED versions of GLS are
employed.
Figure 16. Wiring Diagram 1
In Figure 16, Wiring Diagram 1, the basic switch contact is open.
The current for the LED can flow through the LED (via the load)
and the LED illuminates.
Figure 17. Wiring Diagram 2
In Figure 17, Wiring Diagram 2, the basic switch contact is
closed. The current for the LED cannot flow through the LED and
the LED will not illuminate.
Figure 18. Wiring Diagram 3
In Figure 18, Wiring Diagram 3, regardless of the position of the
basic switch, the current for the LED can flow through the LED
and the LED will illuminate indicating power available.
Figure 19. Wiring Diagram 4
In Figure 19, Wiring Diagram 4, when the load is energized the
LED will illuminate. The above examples suggest options with
these versions of GLS. The LED pilot lights should be treated as
’’for indication only’’ devices.
Note:
While every effort is made to ensure that the above guidelines are
accurate, no responsibility can be accepted for failure to apply good engineering
practice to machinery design and use of Honeywell products. Never apply any of
the procedures outlined above on live circuits. Ensure that testing of changes is
carried out with no risk of injury during tests. These guidelines are produced to help
our customers make the right choices in applying our Limit Switches to general
applications. Contact your local Honeywell representative if you have any difficulties.