Operation Of The Line Connection Components Via An Isolating Transformer - Siemens SINAMICS S120 Equipment Manual
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Figure 4-21
4.8.5
Operation of the line connection components via an isolating transformer
The isolating transformer converts the type of system grounding of the installation (e.g. IT
system) to a TN system with grounded neutral point. 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 Power Module and/or the motor is not adequate for the voltages that
occur.
● There is no compatibility to an existing residual current device.
● The installation altitude is greater than 2000 m above sea level.
● A line filter should always be used for all systems that are not TN or TT systems with
grounded neutral point.
An isolating transformer must have the following properties:
● The transformer must have a star connection on the secondary side.
● The neutral point must be brought out.
AC Drive
Manual, 06/2019, 6SL3097-5AL00-0BP1
Connecting to the line supply using an autotransformer
Mains connection and line-side power components
4.8 Line connection variants
73
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