12-pulse parallel connection
3.2 Configuration
12-pulse applications
Compact User Manual, 09/2015, A5E34871844H
17
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.
-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
diagram 6902 in the SINAMICS DCM List Manual.
Dimensioning of the converter transformer
Application with three-winding converter transformer
2) Overvoltage protection
8) Current setpoint input
U
N
= rated voltage of the line supply connected at the converter input
I
d
= 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, u
k
= 4 % to 6 %
Transformer type rating: S
T
= UN × 1,35 × 1,05 × Id × 2
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