AC Supplies Requiring Transformers
If the distribution transformer is configured as shown in the
figures below, an isolation transformer is required.
If an isolation transformer is used between the power
distribution point and the drives, the transformer secondary
must be grounded for safety reasons as shown in the figures
below.
Figure 7: Three Phase Delta (with mid-phase GND)
Distribution to a Three-Phase Delta/WYE
Isolation Transformer
Figure 8: Three Phase WYE (ungrounded) Distribution to a
Three-Phase Delta/WYE Isolation Transformer
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