Active Line Connection Modules - Siemens SINAMICS S120 Manual

Figure 2-3
2.4.3

Active Line Connection Modules

Active Line Connection Modules comprise a Line Connection Module, a liquid-cooled Active
Interface Module and a liquid-cooled Active Line Module installed in a cabinet system.
Active Line Connection Modules can inject energy into the DC voltage link and feed
regenerative energy into the line supply. The use of an additional Motor Module as Braking
Module is only required if the drives need to be decelerated in a controlled manner after a
power failure (i.e. when energy cannot be fed back into the line supply).
In contrast to Basic Line Connection Modules, Active Line Connection Modules generate a
regulated DC voltage which remains constant irrespective of fluctuations in the line voltage.
However, in this case, the line voltage must remain within the permissible tolerance range.
Active Line Connection Modules draw a virtually sinusoidal current from the supply which
limits any damaging current harmonics.
Active Line Connection Modules always contain an Active Interface Module, which in
addition to a Clean Power Filter, also includes the necessary precharging circuit for the
Active Line Module.
Figure 2-4
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A
Basic Line Connection Module >800 A
Active Line Connection Module with Active Interface Module and Active Line Module
≤800 A
System overview
2.4 Line Connection Modules
29