Line Connection Modules; General Information; Basic Line Connection Modules - Siemens SINAMICS S120 Manual

System overview

2.4 Line Connection Modules

2.4 Line Connection Modules
2.4.1

General information

Power is fed to the drive assembly via Line Connection Modules, which generate a DC
voltage from the line voltage and, therefore, supply energy to the Motor Modules connected
to the DC link. They are suitable for connection to systems grounded at the neutral point
(TN, TT) and non-grounded (IT) systems.
The Line Connection Modules are connected to the line supply and are implemented as
standard in accordance with EN 61800-3 Category C3.
2.4.2

Basic Line Connection Modules

Basic Line Connection Modules comprise a Line Connection Module and a liquid-cooled
Basic Line Module installed in a cabinet system.
Basic Line Connection Modules are designed only for infeed operation, i.e., they are not
capable of feeding regenerative energy back into the supply system.
If regenerative energy is produced, e.g. when the drives brake, it must be converted into
heat in external braking resistors using a supplementary Motor Module, which is used as
Braking Module.
When a Basic Line Connection Module is used as the infeed, a line reactor appropriate for
the supply conditions must be installed. If the infeed is realized via a transformer with an
appropriate rating in 6-pulse operation with a Basic Line Connection Module or in 12-pulse
operation with two Basic Line Connection Modules, the line reactor is optional and can be
omitted.
If two or more Basic Line Connection Modules are operated in parallel on a common supply
system in order to increase power, then line reactors must also be used.
Figure 2-2
28
Basic Line Connection Module ≤800 A
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A