Siemens SINAMICS DCM - Power Increase with Parallel Connection; Parallel Connection of Additional SINAMICS DCM Devices in 6-Pulse Operation

12-pulse parallel connection
3.2 Configuration
12-pulse applications
14 Compact User Manual, 09/2015, A5E34871844H
3.2.1
Power increase with parallel connection
In order to increase power, additional SINAMICS DCMs can be connected in parallel.
The options permitted for the parallel connection of SINAMICS DCM devices are described
in the chapters "Parallel connection of additional SINAMICS DCM devices in 6-pulse
operation (Page 14)" and "Parallel connection of additional SINAMICS DCM units in 12-
pulse operation (Page 15)".
3.2.1.1
Parallel connection of additional SINAMICS DCM devices in 6-pulse operation
A maximum of 5 additional SINAMICS DCM devices (M1P1 to M1P5 and S1P1 to S1P5) can
be connected in parallel to the SINAMICS DCM devices of the 12-pulse unit (master M1 and
slave S1) in 6-pulse operation (for details on the 6-pulse parallel connection, see SINAMICS
DCM operating instructions, chapter "Connecting devices in parallel and in series").
The following figure shows an example with one device connected in parallel:
1) Transformer
2) Overvoltage protection
3) Insulation monitoring
4) SINAMICS DCM
5) Smoothing reactor
6) DC motor
7) Line reactor 8) Data exchange (12-pulse
parallel connection)
9) Data exchange (6-pulse par-
allel connection)
U
N
= rated voltage of the line supply connected at the converter input
I
d
= direct current of a partial converter (¼ total direct current)
Figure 3-4 Parallel connection of additional SINAMICS DCM devices in 6-pulse operation
Explanation of the abbreviations
M1
Master, first branch
M1P1
6-pulse slave of M1