Parallel connection and 12-pulse applications of SINAMICS DC MASTER integrated in the drive cabinet

Under certain preconditions it may make sense to connect converters in parallel, e.g. to increase the power rating or to provide redundancy (operating mode "(n+m operation")). SINAMICS DC MASTER are suitable for these types of applications and on request, the appropriate configuration can also be implemented as cabinet version. You are provided with a ready-to-connect cabinet system with components that are optimally harmonized with one another, including detailed documentation and circuit diagrams.

Further, for 12-pulse applications, the smoothing reactor on the DC side can be dimensioned and integrated in the drive cabinet.

12-pulse operation

SINAMICS DC MASTER can also be used in redundant operation. In this operating mode, at least two units are connected in parallel. This means that it is possible to maintain operation with the remaining SINAMICS DC MASTER units if one unit fails (e.g. if a fuse fails in the power section). When appropriately configured and interconnected, both the armature circuit as well as the field circuit can be redundantly operated.

SINAMICS DC MASTER units that are still functionable, continue to operate without any interruption when a unit fails. When configuring the system, it is important to note that in redundant applications, the power rating of only n units (instead of n+m units) must be sufficient.

In the case of a fault, the master functionality is automatically transferred. As a consequence, this operating mode is possible both when power sections of the slaves fail and when the power section of the master fails. (MTBF data in redundant operation are available on request.)

The parallel connection can also be used to increase the power rating. Up to six SINAMICS DC MASTER can be connected in parallel. Further, it is possible to select and dimension system-specific power sections, build them up and control them using the Control Module. The power section and the closed-loop control part are shipped as complete cabinet system that is ready to be connected up.