EUCHNER CETx-AP-xxx-AH-xxx (Unicode) - Manual (Page 17)

Operating Instructions Safety Switch CET.-AP-...-AH-...
17
Electrical connection
Warning!
In case of an error, loss of the safety function through incorrect connection.
Ì To ensure safety, both safety outputs (OA and OB) must always be evaluated.
Ì The monitoring output OUT and the door monitoring output OUT D are not
allowed to be used as safety outputs.
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 The power supply for the evaluation electronics is electrically isolated from
the power supply for the guard locking solenoid.
Ì The teach-in input and feedback loop, as well as LED 1 and LED 2 (only ap-
plicable to freely controllable LEDs), have the same ground potential as the
guard locking solenoid.
Ì The device generates its own clock signal on the output lines OA/OB. A
downstream control system must tolerate these pulses, which may have a
length of up to 1 ms.
The pulses are also output when the safety outputs are switched off.
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 voltage 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 applications as per the requirements, a connection cable
listed under UL category code CYJV/7 must be used and the following re-
quirements met: min. 30 V DC, 2 A, 85 °C. The EUCHNER connection cables
in the section Ordering information and accessories meet these require-
ments.
Ì In order to avoid EMC interference, the physical environmental and operating
conditions at the installation site of the device must comply with the require-
ments according to the standard EN 60204-1:2006, section 4.4.2 (EMC).
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.