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4 Installation
4-8 Physical Mounting
17
4-8 Physical Mounting
4-8-1 Installation of Multiple F3SS Units
Figure 4-9 Unsafe Installation Method
Figure 4-9 shows two emitter/receiver pairs. The pair on top is using beam code A and the pair on the bottom is
using beam code B. The optical channels are indicated by solid lines. Each system is operating a different ma-
chine.
Consider the case where emitter B is obstructed. Machine 2 stops. Now emitter A switches to transmitting beam
code B. This is represented by the dashed line. Machine 1 has stopped, but machine 2 has restarted, because
of the optical path created by the dashed line. If two F3SS systems are installed this way, they need to control
the same machine.
The preferred option is to install them so that there is no optical path corresponding to the dashed line. That
could be done with the installation shown in Figure 4-10.
Figure 4-10 Preferred Mounting Orientation
This installation doesn’t allow either receiver to see light from two emitters, making it a safe installation.
4-8-2 Reflective Surface Interference
Reflective surfaces (e.g. shiny metal, glossy paint, foil, plastic) near the infrared beam can create two paths to
the receiver. Install a F3SS system so that there are no reflective surfaces within the beam angle of the emitter
and receiver.
The formula for determining the safe distance from a reflective surface is:
d = R/2(tan 2a)
Where:
d = minimum distance to reflective surface
R = distance between emitter and receiver
a = half angle of F3SS (2.5°, for distances > 3 m(9.8 ft.))
Example:
R = 30m
d = 30/2(tan 2(2.5°))
= 15 tan 5°
= 15(0.0875)
= 1.3 m(4.37 ft.)
Emitter
Receiver
To Machine 1
To Machine 2
Emitter
Reciever
A
B
Emitter
Receiver
To Machine 1
To Machine 2
Emitter
Reciever
A
B
Содержание F3SS
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