Connection example – EUCHNER CES-AH-C03-AH-SM (Unicode) User Manual
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Operating Instructions Safety Switch CES-AH-C03-AH-SM
12
Connection example
Within the device, the shutdown of the two outputs LA and LB is dual-channel. As
such, each of the outputs represents a separate safety output.
1) Load, e.g. valve coil, DC motor, Ohmic load etc.
2) In case of inductive loads, it is imperative free-wheeling diodes are used to protect the outputs on the safety switch.
Figure 2: Connection example with start button and feedback loop
Attention!
Ì
A short circuit between the cables on the safety outputs LA and LB and an-
other cable must be prevented.
Ì
In certain circumstances, a failure exclusion as per EN 13849-1, section 7.3
can be applied, see also EN 13849-2, section D.5.2.
Ì
The CES-AH represents a subsystem as per EN 13849-1 and complies with
PL d. To integrate the switch in a category 3 structure, it is necessary to
monitor the downstream load (the feedback loop must be monitored).
Ì
This example shows only an excerpt that is relevant for connection of the
CES-AH system. The example illustrated here does not show complete
system planning. The user is responsible for safe integration in the overall
system.
Internal
logic
UB
7
+LB
5
+LA
4
START
2
LA
3
LB
6
NC
1
NC
9
0V
8
START
Feedback
loop
Feedback
loop
U
B
GND
1)
2)
1)
2)