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Operating instructions
Non-Contact Safety System CES-A-UEA-02B/CES-A-UEA-04B
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-UEA-02B:
2 read heads
Ì
CES-A-UEA-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 15).
The read heads and actuators are assigned to the device in a special parameter setting 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.
Unlike systems with unique code detection, on multicode devices a specific code is not requested but instead it is only
checked whether the actuator is of a type that can be detected by the system (multicode detection). There is no exact
comparison of the actuator code with the taught-in code in the safety switch (unique code detection). The system possesses
a low coding level.
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.
If a permissible code is detected, the door monitoring output O1...O2 or O1...O4 (semiconductor output) on the related
read head is set to HIGH and the safety outputs (relay output) are 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...
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.
8
(Translation of the original operating instructions) 2097098-18-10/19
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