Operation Of The Line Connection Components Via An Autotransformer; Operation Of The Line Connection Components Via An Isolating Transformer - Siemens SINAMICS S120 Manual

3.9.4

Operation of the line connection components via an autotransformer

In the range up to 3 AC 690 V +10 %, 3 AC 480 V +10 % or 1 AC 240 V +10 %, an
autotransformer can be used to step up or step down the voltage.
Application example:
● The motor insulation must be protected from excessive voltages.
Figure 3-20
3.9.5

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.
AC Drive
Manual, (GH6), 07/2016, 6SL3097-4AL00-0BP5
Connecting to the line supply using an autotransformer
Mains connection and line-side power components
3.9 Line connection variants
79