Siemens S120 - Operation of the Line Connection Components Via an Isolating Transformer

Mains connection and line-side power components
3.9 Line connection variants
AC Drive
Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
83
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.
● 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.
Figure 3-33 Isolating transformer