Operating Instructions
Non-Contact Safety System CES-A-AEA-02B/CES-A-AEA-04B
8
(translation of the original operating instructions) 2084606-19-09/17
6. Function
The safety system consists of three components:
Ì Coded actuator
Ì Read head
Ì Evaluation unit
The number of read heads that can be connected depends on the evaluation unit:
Ì CES-A-AEA-02B: two read heads
Ì CES-A-AEA-04B: four read heads
The evaluation unit can be congured so that a start button (monitoring of the falling edge) and a feedback loop can be
connected to monitor external relays and contactors. The individual conguration is dened by a setup procedure (see
chapter 9. Setup on page 15).
The read heads and actuators are assigned to the device in a special teach-in operation.
Each delivered actuator possesses a unique electronic coding and so is a unique element in the system used. The code in
an actuator cannot be reprogrammed.
The read heads are fastened to the xed part of the safety guard and are each connected to the evaluation unit via a two-
core shielded cable (terminals H.1, H.2 and SH.).
The actuator fastened to the movable part of the safety guard is moved towards the read head by closing the door. When the
switch-on distance is reached, power is supplied to the actuator by the read head by induction and data can be transferred.
The read code is compared with the taught-in code in the evaluation unit.
If the data match, door monitoring output O1…O2 or O1…O4 (semiconductor output) on the related read head is set to HIGH.
If all data for all read heads activated match, the safety outputs (relay output) are then enabled. The OUT LED illuminates.
Optionally, a feedback loop can be connected to the evaluation unit. The evaluation unit can then only be started with the
feedback loop closed. A welded contactor contact in the enable path will thus be detected the next time the machine is started.
Due to the combination of dynamic polling of the actuators and the redundant, diverse design of the safety electronics with
redundantly controlled safety outputs, the evaluation unit will enter the safe state with every detectable fault.
When a safety guard is opened or when guard locking is released, the safety outputs switch off the safety circuit and the
OUT LED goes out. The state of the safety outputs is monitored internally by positively driven NC contacts (relay output).
Independent of the switching state of the safety circuit, the position of all safety doors can be polled via the outputs O1…
O2 or O1…O4 .
If an internal fault occurs in the evaluation unit, the safety circuit is switched off, the diagnostic output (DIA) is set to HIGH
and the DIA LED illuminates red.
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