Parallel Connection Of Power Units - Siemens SINAMICS S120 Function Manual

9.10

Parallel connection of power units

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
Note
For the following power units, when commissioning, a firmware version ≥ V5.2 must be
available.
● Active Line Module in the booksize format
● Active Line Modules in the Chassis-2 format
● Motor Modules in the Chassis-2 format
● Active Line Modules in the Booksize format
● Chassis, Chassis-2 or Cabinet format
● The Motor Modules must be operated in the VECTOR control mode.
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
required power by any other means.
● To increase the availability, for example, to maintain emergency operation (possibly also at
a lower rating), if a power unit fails.
Parallel operation is not released under the following conditions:
● Combining different types of Infeed Modules within the same parallel connection (e.g. Basic
Line Modules with Smart Line Modules or Basic Line Modules with Active Line Modules).
● Motor Modules in servo control
● Motor Modules in the Booksize and Blocksize formats
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Function modules
9.10 Parallel connection of power units
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