EN Series Drives Manual
If the distribution transformer is configured as shown in Figure 13 or Figure
14, 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.
DISFit DUI ION PANEL
r
3 0 ISOLATION TRANSI ORME R
r
Ll I
L3
PE
EARTH J I (Protective Ear-11)1
L GROUND
Figure 13
. To Fusing and
EN Drive LI Terminals
Example 3: Three Phase Delta /Delta (With Midphase GND)
Distribution to a Three phase WYE WYE Isolation
Transformer.
DISTRIBUTION PANEL
T-7
GROUND =
3 0 ISOLA-ION TRANSI ORMFR
(Protect'
I 7
To Fusing and
EN Drive JI Terminals
Figure 14 Example 4: Three phase Delta WYE (ungrounded) Distribution
to a Three Phase WYE/WYE Isolation Transformer
20
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