Siemens SINAMICS S120 Manual page 190

Line Modules
5.4 Active Line Modules
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
Parallel connection of Active Line Modules to increase power rating
Up to four Active Line Modules with the same power rating can be connected in parallel in
order to increase power.
The following rules must be observed when connecting Active Line Modules in parallel:
• Up to four identical Active Line Modules can be connected in parallel.
• Each Active Line Module requires its own Active Interface Module.
• A common Control Unit is required whenever the modules are connected in parallel.
• For multiple infeed units, power must be supplied to the systems from a common infeed
point (i.e. different supply systems are not permitted).
• A derating factor of 5% must be taken into consideration, regardless of the number of
modules connected in parallel.
Note
Mixed operation is not possible
It is only possible to connect power units in parallel if all of them have the same hardware
version. Mixed operation between a power unit with Control Interface Module (article
number 6SL33xx-xxxxx–xAA3) and a power unit with Control Interface Board (article number
6SL33xx-xxxxx–xAA0) is not possible.
188
Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3