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Installation and connection
4.2 Changeover and monitoring module
The power supply of Group 2 location is supplied via an isolating transformer. For protection
against indirect contact, one of the following measures is to be used for the transformer:
Protective insulation according to DIN VDE 0100-410 (VDE 0100 Part 410):2007-06, 413.2 (Use of
a protection class II transformer)
Protection by non-conductive location according to DIN VDE 0100-410 (VDE 0100 Part
410):2007-06, section 413.3
Protection by a local, earth-free equipotential bonding according to DIN VDE 0100-410 (VDE
0100 Part 410):2007-06, section 413.4
Protection by special installation. For this measure, please note the following:
– The protection class I transformer must be installed isolated and must not be connected to
the PE conductor. In Bender's ES710 range of transformers, the fixing angles are isolated
from the transformer core.
– A warning label is to be affixed to the transformer and its cover as follows:
– The transformer is to be installed behind a cover, which can only be opened using a tool or a
special key. It must only be accessed by skilled persons.
– The shield winding can be connected to the PE conductor. It must be ensured that the con-
necting wire is installed so that it is short-circuit proof and earth-fault proof.
4.2.1
Typical connection
Connect your changeover module to the supply sources as follows:
Preferred supply (line 1)
Second supply (line 2)
Connect the primary winding of the transformer to the terminals X1:5 and X1:9 and the second-
ary winding to terminals X1:7 and X1:11. A cross section that conforms to DIN VDE 0100 Part
430 must be selected.
TGH1322en/06.2009
All manuals and user guides at all-guides.com
Warning! Accessible parts of the transformer may
be live. You must always verify that there is no
voltage present before touching parts of it.
Terminals X1:1 and X1:2
Terminals X1:3 and X1:4
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