Operating Line Connection Components Via An Isolating Transformer - Siemens Sinamics S120 Manual

3.11.3.5

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
● There is no compatibility with an existing residual-current protective device.
● The installation altitude is greater 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
Danger to life due to electric shock in the event that an isolating transformer is not used
To implement safe electrical separation, an isolating transformer must be used with high
voltages.
• Install an isolating transformer for voltages > 480 V +10%.
An isolating transformer must have the following properties:
● The transformer secondary side must have the star connection (a delta connection is not
● The neutral conductor must be brought out. It must be connected to the PE of the line
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
occur.
grounded neutral conductor.
DANGER
permissible).
filter, line reactor or AIM and Line Module (infeed).
Caution: If the neutral conductor is not brought out and/or not connected, then all of the
restrictions of an IT system apply.
Line connection and line-side power components
3.11 Line connection variants
149