EUCHNER MGB-L2-xxxAPx-xxx - Manual (Page 18)

18
Operating Instructions MGB-L1...AR.-... / MGB-L2...AR.-... and MGB-L1...AP.-... / MGB-L2...AP.-...
10 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 outputs OD, OT, OL and OI must not be used as safety out-
puts.
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 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 IEC 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 The mounting of conduits directly on the MGB is not allowed. Cables are
only allowed to be connected via suitable cable glands. For this purpose use
EUCHNER cable gland of type EKPM20/06U. Equivalent cable glands can be
used if they are UL-listed (QCRV) and are suitable for the related cable diam-
eter (22 AWG – 17 AWG).
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 To prevent EMC problems, it is imperative you follow section 10.4 Notes
on cable laying, page 20. Follow EMC notes on devices in the immediate
vicinity of the MGB system and their cables.
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 DIN 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).