12
EN Drive Installation Manual
Figure 7: 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 8: Three Phase Delta (with mid-phase GND) Distribution to a Three-Phase
Delta/WYE Isolation Transformer
DISTRIBUTION PANEL
SECONDARY
L3
L2
230 VAC
L1
PE
(Protective Earth)
EARTH
GROUND
To Fusing and
Drive Terminal
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