Specifications
Presence Sensing Safety Devices
Safedge™ Profiles
2-104
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Publication S117-CA001A-EN-P
Overview
General 1-Principles
2-Safety Edges 3-Safety Switches 4-Operator
Interface
5-Logic
R
System Components
The Safedge sensitive edge systems are used in a variety of
applications where the edge of an object must be detected by
contact. The Safedge system consists of three parts: 1) a C-rail,
which is used to mount the profile; 2) a profile, which contains the
sensing surface; and 3) a control unit, which checks the operation of
the profile and interfaces with the control system. A typical system
is shown below.
SAFEDGE
R
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T
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P
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z 0
r 2
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c
IP
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os
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us
t tigh
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t to
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S
a
fe
ty
C
o
n
ta
c
ts
2
5
0
V
2
A
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/O
A
u
x
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o
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ta
c
ts
2
5
0
V
2
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/O
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,
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/C
S
a
fe
d
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e
S
trip
V
o
lta
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e
1
2V
d
c
C-Rail
Profile
Control Unit
+
+
Operating Principle
The profile works on the principle of a two-wire design with
conductive rubber. Two wires run the length of the profile. The wires
are terminated with a known resistor. When the profile is deformed,
the conductive rubber comes in contact with each other and causes
the overall resistance to drop.
The control unit provides a voltage source to the wires in the profile.
It continuously checks the continuity of the wires for shorts, opens
and changes in resistance. If the circuit opens, becomes shorted, or
the resistance changes, the output of the control unit turns off.
The control unit can also be used to monitor the performance of the
output switching devices.
Sensing Surface
Control
Unit
Sensing
Surface
Sensing
Length
Sensing
Angle
One distinct advantage of the Safedge system is the active corners.
Pressure applied to the corners is detected by the control unit.
Active Corners
Pressure required is
10 N (2.25 lb) when
applied in this direction
Conductive
Rubber
Flexible Wire
Cores
Non-conductive Rubber
The profile is best actuated along its sensing surface. The sensing
surface of the Safedge system is active along almost the full length
of the edge. The 10 mm at the beginning and end are not active.