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Installation
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 96: Three Phase Delta (with mid-phase GND) Distribution to a Three-Phase
Delta/WYE Isolation Transformer
Figure 97: Three Phase WYE (ungrounded) Distribution to a Three-Phase Delta/WYE
Isolation Transformer
Figure 98: Delta to Delta Isolation Transformer
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