EUCHNER CES-AR-AES-12 - Manual (Page 11)

Operating Instructions AR Evaluation Unit CES-AR-AES-12
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For the autostart mode, a jumper must be connected between the terminals S
and Y1.
By pulsing the output signal on Y1 the device detects short circuits on starting
(e.g. static DC 24 V on input S).
Connecting safety contacts and feedback loop
Important!
If you do not connect the feedback loop, the downstream devices will not be
monitored. This situation will affect the safety category of your system.
The unit has four redundant, positively driven safety contacts that switch off im-
mediately if the actuator is removed at one of the connected safety switches or
if a fault occurs. To check the switching state of a connected load, the auxiliary
contacts on a contactor or relay can be connected to terminals Y1 and Y2 to form
a feedback loop (see Figure 6).
CES-AR-AES
33 43 23 13
Y2 Y1 24 34 44 14
+24 V
Subsequent
devices
(e.g. contactors)
Fig. 6: Safety contacts and feedback loop connected
The unit detects external short circuits on the feedback loop at the start by pulsing
the output signal on Y1 (e.g. static DC 24 V on the feedback loop).