Operating Principle - Siemens SINAMICS S120 Manual

Figure 3-27 Overview of Active Infeed (frame sizes FI/FX and GI/GX)
In the case of an Active Infeed with an Active Line Module of frame sizes HX or JX, the
bypass contactor is not included in the associated Active Interface Module, but must be
provided separately. The Active Interface Modules and Active Line Modules of these frame
sizes have degree of protection IP00.
Figure 3-28 Overview of Active Infeed (frame sizes HI/HX and JI/JX)

Operating principle

One or more Motor Modules can be connected to the power supply network via the Active
Line Module. The Active Line Module provides a constant DC-link voltage for the Motor
Modules. This ensures that they are not influenced by line voltage fluctuations. The
regenerative feedback capability of the Active Line Module can be deactivated by
parameterization.
The Active Line Module is suitable for direct operation both on TN and on IT and TT
systems.
With the motors operating as generators, the Active Line Module feeds regenerative energy
into the supply network.
The Active Line Module is used for:
● Machines with high dynamic drive requirements
● Frequent braking cycles and high braking energy
Chassis power units
Manual, (GH3), 01/2013, 6SL3097-4AE00-0BP3
Line Modules
3.4 Active Line Modules
149