Siemens SINAMICS DCM Operating Instructions Manual page 583

Figure 10-84 12-pulse series connection: Controlled + uncontrolled rectifier, block diagram
10.26.7 Switchover of the power unit topology – Option S50
Ordering information for option S50, see Chapter "Ordering information (Page 25)".
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 "Preface (Page 3)").
In certain applications, it is necessary to switch between a 12-pulse parallel connection and
a 12-pulse series connection during operation using a control 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 SINAMICS DCMs involved must be equipped with option S50.
● It is not permissible that the "n+m" mode is used.
● The function of the "parallel switching master" must remain on the same SINAMICS DCM
in both power unit topologies.
SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A
Descriptions of functions
10.26 Connecting units in parallel and in series
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