12-pulse applications
Compact User Manual, 09/2015, A5E34871844H
43
Switchover of the power unit topology - option S50
Note
The SINAMICS DCM can only be equipped or retrofitted with option S50 in the factory.
In certain applications, it is necessary to switch between two different power unit topologies
(such as between 12-pulse parallel connection and 12-pulse series connection) during
operation by means of a command.
SINAMICS DCM converters with option S50 provide the control for this purpose. The actual
switch between power unit topologies is performed with external contactors.
The detailed functionality and a recommended interconnection are provided in function block
diagram 9360 in the SINAMICS DCM List Manual.
Please contact your local Siemens office or Customer Support for more information.
Prerequisites for the switchover of the power unit topology
● All SINAMICS DCMs involved must be equipped with option S50.
● No "n+m" mode may be used.
● The "parallel/series switching master" function must remain at the same SINAMICS DCM
for both power unit topologies.
● SINAMICS DCM software version V1.3 or higher.
● All SINAMICS DCMs must have the same software version.
The following parameters must be set separately for the two power unit topologies:
Mode of operation of the armature converter
Position of the power unit in the topology
Number of active power units
Mode of operation of the armature converter
Position of the power unit in the topology
Number of active power units
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