Siemens SINAMICS DCM Manual page 106

For the filters to have maximum effect, it is absolutely essential that they and the device are
installed on a single metal plate.
In the case of converters with a 3-phase connection, the minimum rated current of the filter is
the same as the device's input current or output DC current, as specified on the device rating
plate (see Armature Input and Armature Output respectively), times 0.82.
In the case of a two-phase connection (field supply), only two phases are connected to the
three-phase radio interference suppression filter. In this case, the minimum rated current of
the filter is the same as the input current (see Field input) or field DC current specified on the
device rating plate.
6.1.5 Information on line-side harmonics produced by converter units in a fully-
controlled two-pulse bridge circuit configuration (B6C and (B6)A(B6)C)
The majority of converter units for medium-power applications have a fully-controlled two-
pulse bridge circuit configuration. Below is an example of the harmonics that can be found in
a typical system configuration for two firing angles (α = 20° and α = 60°).
The values have been taken from a previous publication, "Oberschwingungen im
netzseitigen Strom sechspulsiger netzgeführter Stromrichter (Harmonics in the Line-Side
Current of Six-Pulse, Line-Commutated Converters)" by H. Arremann and G. Möltgen,
Siemens Research and Development Division, Volume 7 (1978) No. 2, Springer-Verlag
1978.
In addition, the example specifies formulae which, depending on the actual operating data in
use [line voltage (no-load voltage U
calculate the short-circuit power S
specified harmonics spectrum applies. If the actual line short-circuit power and/or actual
armature inductance deviate from the values calculated in this way, then they will need to be
calculated on a case-by-case basis.
The harmonics spectrum listed below is produced if the values for the short-circuit power S
at the unit terminal and the armature inductance L
formulae below, match the actual values found in the system. If the values do not match, a
separate calculation procedure will need to be carried out for the harmonics.
a) α = 20°
Fundamental factor g = 0.962
ν I
5 0.235
7 0.100
11 0.083
13 0.056
17 0.046
19 0.035
23 0.028
25 0.024
The fundamental component of current I
following formula:
I = g × 0.817 × I
1
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
/I ν I /I
ν 1 ν 1
29 0.018
31 0.016
35 0.011
37 0.010
41 0.006
43 0.006
47 0.003
49 0.003
d
ac.maher.co.ir
6.1 Instructions for EMC-compliant drive installation
), line frequency f , and DC current I
v0 N
and armature inductance L
K
of the motor, calculated using the
a
b) α = 60°
Fundamental factor g = 0.953
ν I /I
ν 1
5 0.283
7 0.050
11 0.089
13 0.038
17 0.050
19 0.029
23 0.034
25 0.023
as a reference variable is calculated using the
1
Connecting
], can be used to
d
for the motor to which the
a
ν I /I
ν 1
29 0.026
31 0.019
35 0.020
37 0.016
41 0.016
43 0.013
47 0.013
49 0.011
K
107