Siemens SINAMICS S120 Equipment Manual page 222

Line Modules
5.5 Active Line Modules Chassis-2
Active Infeed Module Chassis-2 components
An Active Infeed comprises an Active Interface Module and an Active Line Module.
For an Active Infeed Chassis-2 with an Active Line Module Chassis-2, the pre-charging input
circuit (pre-charge contactor, pre-charge resistors, bypass contactor) must be provided
separately. The Active Interface Modules Chassis-2 and Active Line Modules Chassis-2
have degree of protection IP00.
Figure 5-41 Active Infeed Chassis-2 overview
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
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Air-cooled chassis power units
Manual, 07/2019, 6SL3097-4AE00-0BP9