EUCHNER CES-AZ-AES Series, Operating Instructions Manual

Page: 9 / 52

9
2104766-13-08/20 (Translation of the original operating instructions)
Operating instructions
Non-Contact Safety System CES-AZ-AES-…
EN
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-AZ-AES-01B:

1 read head
Ì CES-AZ-AES-02B:

2 read heads
Ì CES-AZ-AES-04B:

4 read heads
The evaluation unit can be configured 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 configuration is defined by a setup procedure (see
chapter 9. Setup on page 16 ).
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 fixed part of the 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 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 or 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 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 or
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.