Line-side power components
3.8 Line connection versions
64
SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5
Operating line connection components via an isolating transformer
An isolating transformer converts the line supply type of the plant or system (e.g. IT system)
to a TN system. Additional voltage adaptation to the permissible voltage tolerance range is
possible.
An isolating transformer must be used in the following cases:
● The insulation of the Motor Module and/or the motor is not suitable for the voltages that
occur.
● There is no compatibility with an existing residual-current protective device.
● The installation altitude is higher than 2000 m above sea level.
● A line filter should be used in a line supply system that is not a TN line supply system with
grounded neutral conductor.
An isolating transformer must have the following properties:
● The transformer secondary must be in the star connection (a delta connection is not
permissible!).
● The neutral conductor must be brought out. It must be connected with the PE of the li
ne
f
ilter, line reactor and S120 Combi (infeed).
: If the neutral conductor is not brought out and/or not connected, then all of the
restrictions of an IT line supply apply!
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