Siemens SINAMICS S120 Manual page 220

Line Modules
5.5 Active Line Modules Chassis-2
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 Chassis-2 to increase power rating
To increase the power, a parallel connection of up to six Active Line Modules Chassis-2 with
the same output is possible.
For a parallel connection of Active Line Modules Chassis-2, the following rules must be
observed:
• Up to 6 identical Active Line Modules Chassis-2 can be connected in parallel.
• Each Active Line Module Chassis-2 requires its own Active Interface Module Chassis-2.
• Parallel connection can only be implemented using one common Control Unit.
For more than 4 power units, these must be distributed as symmetrically as possible
between at least two DRIVE-CLiQ ports (e.g. 3x 2 Active Line Modules Chassis-2 in series,
or a minimum of 2x 3 Active Line Modules Chassis-2 in series).
• For multiple infeed units, power must be supplied to the systems from a common infeed
point (i.e. different supply systems are not permitted).
• The Active Line Modules Chassis-2 must supply a shared DC link.
• 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 of an Active Line Module (article number 6SL3330-xxxxx–xAAx) and
an Active Line Module Chassis-2 (article number 6SL3331-xxxxx–xAA0) is not possible.
218
Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3