Siemens SINAMICS DCM User manual

SINAMICS DCM
12-pulse applications
Compact User Manual
09/2015
A5E34871844H
Instructions
1
Area of application
2
12-pulse parallel connection
3
12-pulse series connection
4
Switchover of the power unit
topology - option S50
5

Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E34871844H
Ⓟ
09/2015 Subject to change
Copyright © Siemens AG 2012 - 2015.
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editions.

12-pulse applications
Compact User Manual, 09/2015, A5E34871844H 5
Table of contents
1 Instructions ............................................................................................................................................. 7
2 Area of application .................................................................................................................................. 9
3 12-pulse parallel connection.................................................................................................................. 11
3.1 Topologies ..............................................................................................................................11
3.2 Configuration...........................................................................................................................13
3.2.1 Power increase with parallel connection.................................................................................14
3.2.1.1 Parallel connection of additional SINAMICS DCM devices in 6-pulse operation ...................14
3.2.1.2 Parallel connection of additional SINAMICS DCM units in 12-pulse operation......................15
3.2.2 Prerequisites for the device ....................................................................................................16
3.2.3 Dimensioning of the converter transformer.............................................................................17
3.2.4 Dimensioning of the smoothing reactors ................................................................................19
3.2.5 Selection for overvoltage protection .......................................................................................20
3.2.6 Insulation monitoring...............................................................................................................21
3.3 Commissioning .......................................................................................................................21
3.3.1 Specifying the operating mode ...............................................................................................22
3.3.2 Additional parameter settings .................................................................................................23
3.3.3 Carrying out commissioning ...................................................................................................24
3.3.4 Optimization runs ....................................................................................................................24
3.3.4.1 Optimization for 2 individual reactors......................................................................................25
3.3.4.2 Optimization for an interphase transformer ............................................................................26
4 12-pulse series connection.................................................................................................................... 27
4.1 Topologies ..............................................................................................................................27
4.1.1 12-pulse series connection of two SINAMICS DCMs.............................................................27
4.1.2 12-pulse series connection: controlled converter + uncontrolled converter ...........................29
4.2 Configuration...........................................................................................................................30
4.2.1 Power increase with parallel connection.................................................................................30
4.2.2 Prerequisites for the device ....................................................................................................31
4.2.3 Dimensioning of the converter transformer.............................................................................33
4.2.4 Voltage limits...........................................................................................................................34
4.2.5 Selection for overvoltage protection .......................................................................................36
4.2.6 Insulation monitoring...............................................................................................................37
4.3 Commissioning .......................................................................................................................37
4.3.1 Additional parameter settings .................................................................................................37
4.3.2 Carrying out commissioning ...................................................................................................40
4.3.3 Optimization runs ....................................................................................................................41
5 Switchover of the power unit topology - option S50................................................................................ 43
Index..................................................................................................................................................... 47

Table of contents
12-pulse applications
6Compact User Manual, 09/2015, A5E34871844H

12-pulse applications
Compact User Manual, 09/2015, A5E34871844H 7
Instructions
1
Note
This application document does not claim to contain all details and versions of
units, or to
take into account all conceivable operational cases and applications.
The standard applications do not represent specific customer solutions, but are only
intended to provide support in the implementation of typical applications. The operator
is
responsible for the correct operation of the products described.
Should you require further information or encounter specific problems which have not been
handled in enough detail, please contact your local Siemens office.
The contents of this applicat
ion document are not part of an earlier or existing contract,
agreement or legal relationship, nor do they change such contracts, agreements or legal
relationships. The sales contract represents the overall obligations of the PD Process
Industries and Driv
es Division of Siemens AG. The warranty specified in the contract
between the parties is the only warranty accepted by PD Process Industries and Drives of
Siemens AG. Any statements contained herein neither create new warranties nor modify the
existing war
ranty.
WARNING
Observe safety notices in the associated operating instructions
The units listed here contain dangerous electric voltages, dangerous rotating machine parts
(fans) and control rotating mechanical parts (drives). Failure to follow the relevant operating
instructions may result in death, serious injury or extensive material damage.
Technical Support
You can also find support for technical issues here:
Technical Support: (https://support.industry.siemens.com/cs/ww/en/ps/13298)

Instructions
12-pulse applications
8Compact User Manual, 09/2015, A5E34871844H

12-pulse applications
Compact User Manual, 09/2015, A5E34871844H 9
Area of application
2
This application document provides support for SINAMICS DCM converters in 12-pulse
applications.
In order to make sense of this application document, it is assumed that the reader has read
the contents of the SINAMICS DCM operating instructions.
The following converter topologies are covered:
●12-pulse parallel operation
This mode of operation is especially used at higher power ratings to achieve lower line
harmonics. In addition, by using this circuit, a lower DC current ripple is obtained when
compared to a 6-pulse connection.
●12-pulse series operation
This mode of operation is ideal when converting from older systems to digital control
(using a SINAMICS DC MASTER Control Module) while keeping the existing power unit
and consequently the nominal system data.
The following subjects are covered:
●Configuration of the required components
●Commissioning
●Switchover of the power unit topology - option S50
Note
Based on the engineering and commissioning examples described here, redundant
operation is not possible.

Area of application
12-pulse applications
10 Compact User Manual, 09/2015, A5E34871844H

12-pulse applications
Compact User Manual, 09/2015, A5E34871844H 11
12-pulse parallel connection
3
3.1
Topologies
Topology
The following diagram shows the topology of a 12-pulse parallel connection.
Figure 3-1 12-pulse parallel connection (1), block diagram
The following diagram shows the topology of a 12-pulse parallel connection, where an
additional 6-pulse converter is connected in parallel to each of the two 12-pulse converters
connected in parallel.

12-pulse parallel connection
3.1 Topologies
12-pulse applications
12 Compact User Manual, 09/2015, A5E34871844H
Figure 3-2 12-pulse parallel connection (2), block diagram
Note
If additional con
verters are connected in parallel to the master converter, then exactly the
same number of converters must also be connected in parallel with the slave converter.
Operation of 12-pulse parallel connection and 6-pulse parallel connection
For the converter topologies as shown in Fig. 3-1 and Fig. 3-2, the following mixed operation
is permissible:
Master side: 4Q unit(s)
Slave side: 2Q unit(s)
This means, in torque direction 1, 12-pulse operation – and in torque direction 2, 6-pulse
operation.
In some special cases, this operating mode is used to address the following requirements:
●Asymmetrical current demand (infeed power is far higher than the regenerative infeed
power)
●A high-speed DC breaker should be used in the armature circuit for fast shutdown in
regenerative operation. This high-speed breaker only has to be dimensioned for
regenerative operation (energy recovery) – and is only necessary for the 4Q units.
Reactor to decouple the partial converters: We recommend that individual reactors are used
instead of an interphase transformer.
Reason: In 6-pulse operation, current only flows through the interphase transformer at one

12-pulse parallel connection
3.2 Configuration
12-pulse applications
Compact User Manual, 09/2015, A5E34871844H 13
side, and would therefore consequentially go into saturation.
The parameterization: the same as for a pure 12-pulse parallel connection
3.2
Configuration
Not permitted: Operation of several 12-pulse systems on a common 12-pulse transformer
The operation of several 12-pulse systems on a common 12-pulse transformer (see figure
below) is not permitted. This can cause balance currents, which can result in a blown fuse or
even damage (e.g., thyristor damage).
See the FAQ for 6RA70, SIMOREG DC MASTER and SIMOREG DC MASTER Control
Module. More than one 12-pulse system on a transformer
(https://support.industry.siemens.com/cs/ww/en/view/26041969)
Figure 3-3 Non-permissible parallel connection
However, you can connect devices in parallel according to Figure 3-4 Parallel connection of
additional SINAMICS DCM devices in 6-pulse operation (Page 14) or Figure 3-5 Parallel
connection of additional SINAMICS DCM units in 12-pulse operation (Page 15).

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)
UN= rated voltage of the line supply connected at the converter input
Id= 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

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)
UN= rated voltage of the line supply connected at the converter input
Id= 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).

12-pulse parallel connection
3.2 Configuration
12-pulse applications
16 Compact User Manual, 09/2015, A5E34871844H
Advantages and disadvantages of this configuration:
●Advantage: Lower current ripple
●Disadvantage: Each unit requires its own 12-pulse transformer
3.2.2
Prerequisites for the device
Transformer
12-pulse operation is achieved in the network by an additional winding system, electrically
swiveled by 30°, belonging to the supplying transformer. Here at least one of the two
converters (master or slave) of the 12-pulse system must be supplied via a galvanically
isolated voltage (isolating transformer) (see Figure 3-6 Application with three-winding
converter transformer (Page 17) and Figure 3-7 Application with isolation transformer
(Page 18)).
It is possible to select which of the two converters should be supplied by the voltage leading
or lagging by approx. 30° as required.
Converter equipment
Signal connection via parallel interface.
The parallel interface cable between the converters should be as short as possible. The
permitted maximum cable length of 15 m should not be used if possible.
The total length of the bus cables for the parallel connector must not exceed 30 m (e.g.,
maximum 2 x 15 m with a master device with 2 slave devices), whereby the cables must
always be as short as possible. If several devices are connected in parallel, the master
device must be arranged in the center of the bus connection; the slave devices on either side
are distributed as evenly as possible.
Equipotential bonding must be provided and the shield must be connected to ground with a
large contact surface on either side.
All SINAMICS DCMs must have the same software version.
Smoothing reactor
Since the instantaneous values of device output voltages differ due to the different phase
angle of the line infeed, decoupling via smoothing reactors must be provided upstream of the
parallel device connection on the DC voltage side.
Overvoltage protection
Converter equipment which is connected to the line supply via a separate converter
transformer must be protected against overvoltages that can occur as a result of line-side
switching operations by means of overvoltage protection.
If the converter input is protected by means of open contact gaps during primary-side
transformer switching operations, no protective circuit is required at the converter input.

12-pulse parallel connection
3.2 Configuration
12-pulse applications
Compact User Manual, 09/2015, A5E34871844H 17
Insulation monitoring
When using non-grounded low-voltage networks, an insulation monitoring device must be
used to monitor the insulation. The insulation resistance is continuously monitored, and if the
value falls below an adjustable threshold value, this is signaled.
Note
For 12
-pulse applications we recommend that the armature voltag
e is measured close to the
motor. As a consequence, voltage drops across reactors as well as across cable and busbar
systems are automatically taken into account when measuring the armature voltage. The
voltage actually available at the motor is measured.
The external voltage measurement via
analog input AI2 at X177.29
-30 is activated using parameter p51854 = 1.
p51855 is used to scale the analog value measured via X177.29
-30 (AI2). See function
diagram 6902 in the SINAMICS DCM List Manual.
3.2.3
Dimensioning of the converter transformer
Application with three-winding converter transformer
1) Transformer
2) Overvoltage protection
3) Insulation monitoring
4) SINAMICS DCM
5) Smoothing reactor
6) DC motor
8) Current setpoint input
UN= rated voltage of the line supply connected at the converter input
Id= direct current of a partial converter (½ total direct current)
Figure 3-6 Application with three-winding converter transformer
Transformer: A separate three-winding converter transformer is used to connect to the
network of a higher voltage level.
Preferred vector groups for the transformer: Dy5Dd0, Yy0Yd11, uk= 4 % to 6 %
Transformer type rating: ST= UN × 1,35 × 1,05 × Id × 2

12-pulse parallel connection
3.2 Configuration
12-pulse applications
18 Compact User Manual, 09/2015, A5E34871844H
Application with isolation transformer
1) Transformer
2) Overvoltage protection
4) SINAMICS DCM
5) Smoothing reactor
6) DC motor
7) Line reactor
8) Current setpoint input
UN= rated voltage of the line supply connected at the converter input
Id= direct current of a partial converter (½ total direct current)
Figure 3-7 Application with isolation transformer
Transformer: When there is a low-voltage rail, an isolation transformer with a voltage
transformation ratio of 1:1 is used upstream of a converter for a 30° phase offset.
Suitable vector groups for the transformer: Dy11, Yd11, Dy5, uk= 4 % to 6 %
Transformer type rating: ST= UN × 1,35 × 1,05 × Id
Note
If converters are connected in parallel in order to increase the current (parallel connection of
additional max. 5 devices per 6
-pulse branch is possible), a line reactor must be connected
upstream of each converter unit with min. 2% u
Kin order to decouple each converter. In
order to ensure symmetrical current distribution in the parallel converter units, the lowest
possible deviation of th
e impedance values of the individual line reactors is required. In
practice, a 3% difference can be achieved at a reasonable cost. The additional voltage drop
in the line reactors must be taken into account during the configuration.
If converters are used
which do not have any arm fuses and 4Q operation is possible at the
same time, every converter is to be supplied with a fuse on the DC side which has been
dimensioned according to its output current.

12-pulse parallel connection
3.2 Configuration
12-pulse applications
Compact User Manual, 09/2015, A5E34871844H 19
3.2.4
Dimensioning of the smoothing reactors
WARNING
The correct dimensioning of smoothing reactors is very important and should be made only
by persons with sufficient knowledge of 12-pulse applications.
If the inductance of the smoothing reactors is too low, instead of 60° long current blocks,
this may result in 30° long current blocks of twice the size in both partial converters. In this
case, even if the semiconductor fuses are correctly dimensioned, the thyristors may not be
protected and will quickly be destroyed.
A smoothing reactor is used for each of the two partial converters. The reactor is a 2-value
reactor. This means that the inductance of the reactor is defined for two current values.
The reactor is thermally dimensioned according to the rms value of the DC reactor current.
The following formulas are used for rough estimates of the reactor values.
Calculating the required inductance:
L
D1
= Inductance of the reactor at 0.2 × I
dn
LD2
= inductance of the reactor at 0.33 x Idmax
Inductance for 50 Hz line frequency:
Inductance for 60 Hz line frequency:
L
= Inductance in Henry
Idn
= Half rated DC current of the DC motor
I
dmax
= Half maximum current of the DC motor
U
di
= U
N
× 1,35 (U
N
= rated voltage of the line supply, U
di
ideal DC voltage)
Condition: 3,5 × L
D2 ≥ LD1
If the condition is not fulfilled, L
D2 must be increased accordingly.
The condition is satisfied when Idmax < 2 × Idn

12-pulse parallel connection
3.2 Configuration
12-pulse applications
20 Compact User Manual, 09/2015, A5E34871844H
3.2.5
Selection for overvoltage protection
The purpose of overvoltage protection is to protect the semiconductor valves of converters
against overvoltages between the phases of a three-phase network. The overvoltage
protection limit voltage may not exceed the blocking voltage of the valves to be protected.
Figure 3-8 Overvoltage protection
The transformer is connected on the line side, as shown in the above figure. If the
transformer is disconnected under load, the magnetization energy across the arc of the
primary-side switch is not completely released. In the event of blocked firing pulses, this
energy results in an overvoltage on the secondary side of the transformer and must be
limited by the overvoltage protection.
When switching to no-load operation, the overvoltage protection must only handle the
magnetizing energy of the transformer. The magnetization energy is calculated as follows:
W
M
= Transformer magnetization energy
S
N
= Transformer rated power
Io
= Transformer no-load current
IN
= Transformer rated current
f
= Line frequency in Hz
If the transformer is disconnected in the event of a fault, the shunted energy is greater in
relation to the load, whereby a distinction must still be made between motor and generator
load.
"SICROWBAR 7VV3002 AC overvoltage protection for thyristors and diodes" units are
available as overvoltage protection for the connection between the three line phases.
Information on the calculation of energy to be shunted in the various situations and technical
data for SICROWBAR 7VV3002 can be found in the SICROWBAR 7VV3002 operating
instructions.
Internet link: SICROWBAR overvoltage protection 7VV3002 operating instructions
(https://support.industry.siemens.com/cs/ww/en/ps/13450/man)
Dimensioning for 10,000 operating cycles is recommended.