Siemens SINAMICS Series Operating Instructions Manual page 108

Connecting
6.2 Cable routing into the unit
For the purpose of dimensioning filters and compensation equipment with reactors, it is only
possible to draw on the information provided by the harmonics values calculated in this way
if the values calculated for S
separate calculation procedure needs to be carried out (this particularly applies when using
machines with compensation, as they demonstrate a very low armature inductance level).
6.1.7 Data on the line-side harmonics from converter units in a fully-controlled
AC bridge circuit B2C
Converter units for lower power ratings can be connected and parameterized as fully-
controlled AC bridge circuit.
Below is an example for the current harmonics of a typical system configuration of a field
excitation controller (this is a system with a large DC circuit inductance). The case with the
highest harmonic load of the line supply has been selected here.
For every motor used, a separate investigation must be performed to determine the actual
harmonic load. In any case, the result will be less than in the example shown.
For comparison purposes, the table also includes the harmonic load of a B6C three-phase
bridge at the same operating point as the field excitation controller.
Harmonic order
Fundamental content
1)
converter circuit
2)
106
and L
K
B2C
2)
v Iv / I
1 90.1%
1)
3 30.0%
5 18.0%
7 12.9%
9 10.0%
11 8.2%
13 6.9%
15 6.0%
17 5.3%
19 4.7%
21 4.3%
23 3.9%
25 3.6%
match the actual drive values. In all other cases, a
a
B6C Harmonic order
2)
Iv / I v
95.6% 27
29
19.1% 31
13.7% 33
35
8.7% 37
7.4% 39
41
5.6% 43
5.0% 45
47
4.2% 49
3.8%
Operating Instructions, 12/2018, A5E34763375A
B2C B6C
2) 2)
Iv / I Iv / I
3.3%
3.1%
3.3%
2.9% 3.1%
2.7%
2.6% 2.7%
2.4% 2.6%
2.3%
2.2% 2.3%
2.1% 2.2%
2.0%
1.9% 2.0%
1.8% 2.0%
SINAMICS DCM DC Converter