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10 DST transformers
10.1 Selection
Transformers are only needed if the systems voltage exceeds the rated
voltage of the drive controller.
For grounded power supply lines, the line voltage is matched to the rated
voltage of the units using autotransformers which are suited to one
specic output voltage range.
To match the voltage for ungrounded power supply lines, always connect
isolating transformers to prevent excess phase to ground voltages.
10.2 Autotransformers for Drive Controllers
Select an autotransformer suited to both the line voltage and the power
requirements of the system.
Proceed with the selection as follows:
 Determine the rating group using the required rated line voltage
range
in the diagram "Classication of the three-phase alternating current
autotransformers and then locate the transformer ratio "i".
 Calculate the actual transformer output voltage using the rated line
voltage and the transformation ratio "i".
 Check the drive data. The output voltage of the transformer has an
eect on the drive data.
 Select a three-phase autotransformer corresponding to the required
connected load.
Grounded power supply lines
Ungrounded power supply lines
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