Line Modules; Basic Line Modules - Siemens SINAMICS S120 Equipment Manual

System overview

2.4 Line Modules

2.4 Line Modules
Power is fed to the drive line-up via Line 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 grounded (TN, TT) and non-grounded (IT) systems.
The Line Modules are connected to the incoming supply via Line Connection Modules and
are equipped with a radio interference suppression filter in accordance with EN 61800-3,
Category C3 as a standard feature.
2.4.1

Basic Line Modules

Basic Line 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 drives brake, it must be converted to heat by
means of a supplementary Braking Module and a braking resistor.
When a Basic Line Module is used as the infeed, a line reactor is included. If, for example,
the infeed takes place by means of a converter transformer in 12-pulse operation, it is
possible to omit the line reactor.
If two or more Basic Line Modules are operated in parallel on a common supply system in
order to increase power, line reactors are also included in the associated Line Connection
Module.
For a compact configuration, Line Connection Modules up to input currents of 3,200 A are
available. Two Basic Line Modules can be operated in parallel on these Line Connection
Modules. Line-side fuses are installed for selective protection of the individual Basic Line
Modules.
Line Connection Module
Switch
disconnector
with fuses
Figure 2-2
Figure 2-3
24
Main
Basic Line
contactor
Module
Line Connection Module with Basic Line Module ≤ 800 A
Line Connection Module
Basic Line
Circuit breaker
Module
Line Connection Module with Basic Line Module > 800 A
=
Motor
Module
M
3
=
Motor
Module
M
3
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A