Methods Of Line Connection; Operation Of The Line Connection Components On The Supply Line - Siemens SINAMICS S120 Manual

3.9.2

Methods of line connection

A distinction is made between the following line connection types:
● Line connection components to be directly connected to the line supply
● Operation of the line connection components via an autotransformer
● Operation of the line connection components via an isolating transformer
Danger to life due to electric shock if isolating transformer is omitted
To implement safe electrical separation, an isolating transformer must be used with high
voltages. Otherwise, there is a danger to life.
• For voltages > 3 AC 690 V, > 3 AC 480 V +10 % or 1 AC 240 V + 10 %, install an
Note
Line connection of motors
In combination with the drive system, the motors are generally approved for operation on TN
and TT systems with grounded neutral point and on IT systems.
In use on IT systems, the occurrence of a first fault between a live part and ground must be
signaled by a monitoring device. The first fault must be removed as quickly as possible to
minimize temporary overload of the motor insulation.
In all other systems, except TN and TT systems with grounded neutral point and IT systems,
such as systems with a grounded line conductor, an isolating transformer with grounded
neutral point (secondary side) must be connected between the supply and the drive system
in order to protect the motor insulation from continuous excessive stress.
3.9.3

Operation of the line connection components on the supply line

The SINAMICS S drive system is designed to be directly connected to TN and TT systems
with a grounded neutral point as well as to IT systems without line filter. Possible rated
voltages:
● 3 AC 500 V to 3 AC 690 V
● 3 AC 380 V to 3 AC 480 V
● 3 AC 200 V to 3 AC 240 V
● 1 AC 200 V to 1 AC 240 V
AC Drive
Manual, (GH6), 07/2016, 6SL3097-4AL00-0BP5
WARNING
isolating transformer.
Mains connection and line-side power components
3.9 Line connection variants
77