Applications Of Parallel Connections - Siemens SINAMICS S120 Function Manual
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Function modules
7.10 Parallel connection of power units
A slight reduction of the rated current must be considered for parallel connection of power
units. The reduction of the rated current (derating) of a power unit for parallel connection is:
● 7.5% for parallel connections of SINAMICS S120 Basic Line Modules and SINAMICS
● 5.0% for parallel connections of SINAMICS S120 Active Line Modules and SINAMICS
7.10.1
Applications of parallel connections
Power units can be connected in parallel (infeeds) in the following cases:
Version
6-pulse circuit
12-pulse circuit
The following diagram is an overview of the module variants discussed in this section for
inclusion in power unit parallel connections.
Figure 7-25
Parallel connection of power units - overview
Note
Additional information on parallel power unit connections, particularly with regard to their
configuration, can be found in the "SINAMICS Low Voltage Configuration Manual
(https://www.automation.siemens.com/mcms/infocenter/dokumentencenter/ld/Documentsu2
0Catalogs/lv-umrichter/sinamics-engineering-manual-lv-en.pdf)".
504
S120 Smart Line Modules when neither module is equipped with a current compensation
control.
S120 Motor Modules when each module operates with a current compensation control.
Condition
The modules connected in parallel are supplied from a two-winding
transformer.
The modules connected in parallel are supplied via a three-winding
transformer, whose secondary windings supply voltages with a phase shift of
30°.
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
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