Euchner CES-A-AEA-04B (Unicode) User Manual download pdf (Page 6)

Operating Instructions Safety System CES-A-AEA-02B/CES-A-AEA-04B

Function

The safety system CES-A-AEA... complies with the following safety requirements:

Ì Category 4, PLe according to EN ISO 13849-1

Ì Proximity device with self-monitoring type PDF-M according to EN 60947-5-3.

Ì Redundant design of the circuit in the evaluation unit with self-monitoring. As a

result, the safety system is still effective even if a component fails.

Ì When the safety guard is opened and closed, it is checked whether the safety

system relays open and close correctly.

The CES non-contact safety system consists of three components:

Ì Coded actuator

Ì Read head

Ì Evaluation unit

1 to 2 read heads can be connected to the CES-A-AEA-02B evaluation unit and 1

to 4 read heads can be connected to the CES-A-AEA-04B evaluation unit.

It is also possible to connect a start button (monitoring of the falling edge) and a

feedback loop for monitoring external relays and contactors.

The individual conﬁguration is deﬁned by a setup procedure.

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 ﬁxed part of the safety guard and are each

connected to the evaluation unit via a two-core screened cable.

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 bit pattern read is compared with the code saved in the evaluation unit. If the

data match, the door monitoring output O1...O2 or O1...O4 (semiconductor output)

on the related read head is set HIGH. If all data for all read heads activated match,

the safety outputs (relay outputs) 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 release 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 two safety outputs, the evaluation

unit will enter the safe state with every detectable fault.

When a safety guard is opened, 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 HIGH and the DIA LED illuminates red.

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Euchner CES-A-AEA-04B (Unicode) User Manual Page 6