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

Operating Instructions Safety Switch CES-I-AP-U-C04
9
Electrical connection
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 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 0.3 ms.
No test pulses are output when the safety outputs are switched off.
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 The device tolerates voltage interruptions in the operating voltage U
B
of up
to 5 ms. Voltage interruptions on U
B
are also output on the safety outputs
and monitoring outputs.
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.
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).
* 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).