Operating Instructions Safety Systems
MGB-L..B-EI-… (Ethernet/IP) and With Data Structure Type A
22
(translation of the original operating instructions) 2126330-10-03/21
13. Electrical connection
WARNING
In the event of a fault, loss of the safety function due to incorrect connection.
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Mounting must be performed only by authorized personnel.
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Lay the connecting cables with protection to prevent the risk of short circuits.
CAUTION
Risk of damage to equipment or malfunctions as a result of incorrect connection.
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All the electrical connections must either be isolated from the mains supply by a safety transform-
er according to EN IEC 61558-2-6 with limited output voltage in the event of a fault, or by other
equivalent insulation measures.
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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 processing. The cable routing for safety circuits
should be as far away as possible from the cables of the power circuits.
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In order to avoid EMC interference, follow the EMC notes on devices in the immediate vicinity of
the MGB system and its cables.
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In order to avoid EMC interference, the physical environmental and operating conditions at the
installation site of the device must comply with the requirements according to the standard DIN
EN 60204-1:2006, section 4.4.2/EMC).
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The functional earth must be connected. An M6 thread hole is available on the mounting plate
for this purpose.
Important!
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The supply for further devices on the bus may be forwarded via the Euchner MGB system. The
entire supply current through the MGB must not be higher than specified in chapter
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If the device does not appear to function when operating voltage is applied (e.g. Pwr LED does not
illuminate), the safety switch must be returned unopened to the manufacturer.
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To ensure the stated degree of protection is achieved, the cover screws must be tightened to a
tightening torque of 1 Nm.
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Tighten screw for the cover for the auxiliary release to 0.5 Nm.
13.1. Notes about
Important!
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This device is intended to be used with a Class 2 power source in accordance with UL1310
1)
.
As an alternative an LV/C (Limited Voltage/Current) power source with the following properties can
be used:
- This device shall be used with a suitable isolating source in conjunction with a fuse in accordance
with UL248. The fuse shall be rated max. 3.3 A and be installed in the max. 30 V DC power supply
to the device in order to limit the available current to comply with the UL requirements. Please note
possibly lower connection ratings for your device (refer to the technical data).
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The mounting of conduits directly on the MGB is not allowed. Cables are allowed to be connected
only 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 diameter (22 AWG – 17 AWG).
1) 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).