Emerson Control Techniques Epsilon Eb Series Reference Manual page 105

Epsilon Eb and EN Drives Reference Manual
Figure 55: Earth Grounded WYE Distribution Transformer
Figure 56: Earth Grounded Delta Distribution Transformer
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 57: Three Phase Delta (with mid-phase GND) Distribution to a Three-Phase
Delta/WYE Isolation Transformer
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