Siemens SINAMICS DCM Manual page 582

10.27.7 Switchover of the power unit topology - option S50
Ordering information for option S50, see Chapter 2
Note
SINAMICS DCM can only be retrofitted with option S50 in the manufacturers factory.
Note
You can find detailed information on interconnecting, dimensioning and parameterizing in the
application document "12-pulse applications". Support is also available through our
Technical Support organization (for contact address, see the Preface).
In certain applications, it is necessary to switch between 12-pulse parallel connection and
12-pulse series connection during operation by means of a command.
External contactors must be used to switch over the power unit topology. Option S50
provides the required firmware functionality.
Requirements for using this functionality
● All participating SINAMICS DCM units must be equipped with option S50
● "n+m" operation is not permissible
● The "parallel switching master" function must remain at the same SINAMICS DCM for
both power unit topologies
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
10.27 Connecting units in parallel and in series
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Descriptions of functions
583