Siemens SINAMICS DCM Compact User Manual

12-pulse parallel connection
3.2 Configuration
12-pulse applications
Compact User Manual, 09/2015, A5E34871844H
15
S1
12-pulse slave of M1; simultaneously 6-pulse master of S1P1
S1P1
6
-pulse slave of S1
Advantages and disadvantages of this configuration:
● Advantage: Only one 12-pulse transformer is required.
● Disadvantage: Smoothing reactors are required to avoid a higher current ripple.
3.2.1.2
Parallel connection of additional SINAMICS DCM units in 12-pulse operation
The 12-pulse unit (master M1 and slave S1) can be connected in parallel to a maximum of 2
additional 12-pulse units (M2, S2 and M3, S3) on the DC side, whereby the units connected
in parallel follow the setpoints of the first master.
You must ensure that each unit
is supplied by a separate transformer. If this is not the case,
uncontrolled balance currents can occur.
The following figure shows an example with a 12-pulse unit connected in parallel:
1) Transformer
2) Overvoltage protection
3) Insulation monitoring
4) SINAMICS DCM
5) Smoothing reactor
6) DC motor
7) Current setpoint
e.g. peer-to-peer
8) Data exchange (12-pulse
parallel 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 3-5 Parallel connection of additional SINAMICS DCM units in 12-pulse operation
The transformers and smoothing reactors are dimensioned according to points Dimensioning
of the converter transformer (Page 17) and Dimensioning of the smoothing reactors
(Page 19).

Siemens SINAMICS DCM Specifications

General

Brand	Siemens
Model	SINAMICS DCM
Category	Media Converter
Language	English