Parallel Connection Of Power Units - Siemens SINAMICS S120 Function Manual

8.10

Parallel connection of power units

In order to extend the power range, SINAMICS S120 supports the parallel connection of
identical power units such as Line Modules and/or Motor Modules. The prerequisites for
connecting power units in parallel are as follows:
● Same type
● Same type rating
● Same rated voltage
● Same firmware version
● Chassis or cabinet format
● The Motor Modules must be operated in vector control
It makes sense to connect Line Modules and Motor Modules in parallel for the following
reasons:
● To boost the converter output if it is not technically or economically feasible to achieve the
● To increase the availability, for example, to maintain emergency operation (possibly also
Parallel operation is not released under the following conditions:
● Combining different types of Infeed Module within the same parallel connection (e.g.
● Motor Modules in servo control
● Infeed Modules and Motor Modules in the booksize and blocksize formats
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
required power by any other means.
at a lower rating), if a power unit fails.
Basic Line Modules with Smart Line Modules or Basic Line Modules with Active Line
Modules).
Function modules
8.10 Parallel connection of power units
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