EUCHNER ESL-IH-AR - Manual (Page 9)

Operating Instructions ESL
9
Electrical connection
The following connection options are available:
Ì Separate operation
Ì Series connection with Y-distributors from EUCHNER
Ì Series connection, e.g. with wiring in the control cabinet.
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 eval-
uated.
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 have a length of up to 1 ms.
The pulses are also present when the safety outputs are switched off. De-
pending 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 EN 61558-2-6 with limited output
voltage in the event of a fault, or by other equivalent isolation measures.
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
applies 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 of *, a connection ca-
ble listed under the UL category code CYJV2 must be used.
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.
Ì Power devices, which are a powerful source of interference, must be in-
stalled in a separate location away from the input and output circuits for
signal processing. The cable routing for safety circuits should be as far away
as possible 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 are tested according to the requirements of UL508 (protection against electric shock and fire).