Operation principle and hardware description 29
12-pulse connection (option +A004)
The figure below illustrates the difference between 6-pulse and 12-pulse AC supply
connections. 6-pulse connection is standard. If the drive has an even number of supply
modules, you can order it as a 12-pulse version (option +A004).
12-pulse supply connection eliminates the fifth and seventh harmonics, which remarkably
reduces the harmonic distortion of the line current and the conducted emissions.
12-pulse connection requires a three-winding transformer, or two separate transformers.
There is a 30-degree phase shift between the two 6-pulse supply lines, which are
connected to different supply modules through electrically separate switching equipment.
No. Description
1. Supply transformer. See section Electrical power network specification (page 139) for transformer
requirements.
2. Switching equipment
3. Diode supply modules
1 2
3
1 2
3
6-pulse connection
12-pulse connection
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