EUCHNER CES-I-AR-U-C04 (Unicode) - Manual (Page 9)

Operating Instructions Safety Switch CES-I-AR-U-C04
9
Electrical connection
The following connection options are available:
Ì Separate operation
Ì Series connection with Y-distributors from EUCHNER (only with M12 plug con-
nector)
Ì Series connection, e.g. with wiring in the control cabinet
Ì Operation on an AR evaluation unit.
Warning!
In case of an error, loss of the safety function through incorrect connection.
Ì To ensure safety, both safety outputs (FO1A and FO1B) must always be
evaluated.
Ì The monitoring output OD must not be used as a safety output.
Ì Lay the connection cables with protection to prevent the risk of short cir-
cuits.
Caution!
Risk of damage to equipment or malfunctions as a result of incorrect connection.
Ì Do not use a control system with pulsing or switch off the pulsing function in
your control system. The device generates its own clock signal on the output
lines FO1A/FO1B. A downstream control system must tolerate these test
pulses, which may last up to 1 ms.
Depending on the inertia of the connected device (control system, relay,
etc.), this can lead to short switching processes.
Ì The inputs on an evaluation unit connected must be positive-switching, as the
two outputs on the safety switch deliver a level of +24 V in the switched-on
state.
Ì All the electrical connections must either be isolated from the mains supply
by a safety transformer according to IEC 61558-2-6 with limited output volt-
age in the event of a fault, or by other equivalent isolation measures (PELV).
Ì For use and operation as per the requirements, a power supply with the
feature "for use in class 2 circuits" must be used. The same requirement ap-
plies to the safety outputs.
Alternative solutions must comply with the following requirements:
a) Electrically isolated power supply unit with a max. open-circuit voltage of
30 V/DC and a limited current of max. 8 A.
b) Electrically isolated power supply unit in combination with fuse as per UL248.
This fuse should be designed for max. 3.3 A and should be integrated into
the 30 V/DC voltage section.
Ì For use and operation as per the requirements*, a connection cable
listed under the UL category code CYJV2 must be used. The connection
cables from EUCHNER meet these requirements. The same requirement ap-
plies to the safety outputs.
Ì All electrical outputs must have an adequate protective circuit for inductive
loads. The outputs must be protected with a free-wheeling diode for this pur-
pose. RC interference suppression units must not be used.
Ì Power devices which are a powerful source of interference must be installed
in a separate location away from the input and output circuits for signal pro-
cessing. The cable routing for safety circuits should be as far away as pos-
sible from the cables of the power circuits.
* Note on the scope of the UL approval: Only for applications as per NFPA 79 (Industrial Machinery)
The devices have been tested as per the requirements of UL508 (protection against electric shock and fire).