Auxiliary voltage transformers (T21, T101, T111). T21 is standard; T101 and T111 are added
whenever required by the options ordered.
13
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.
Some drive types are available as a 12-pulse version (option +A004).
The 12-pulse supply connection eliminates the fifth and seventh harmonics, which
substantially reduces the harmonic distortion of the line current and the conducted
emissions.
The 12-pulse connection requires a three-winding transformer, or two separate
transformers. There is a phase shift of 30-degrees between the two 6-pulse supply
lines, which are connected to different supply modules through electrically separate
switching equipment.
6-pulse connectionA
12-pulse connectionB
Supply transformer1
Switching equipment2
Diode supply modules3
Operation principle and hardware description 33
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