Technical information

22
230V FX Series Positioning Drive Reference Manual
Figure 15: Phase Delta/Delta Distribution to a Three-Phase WYE/WYE Isolation
Transformer
Figure 16: Three-Phase Delta/WYE Distribution to a Three-Phase WYE/WYE Isolation
Transformer
Transformer Sizing
Most applications will not require a transformer. However, in the following situations a
transformer may be required:
• The secondary of the AC distribution transformer is not electrically referenced to earth
ground (i.e., left floating).
• The nominal voltage available to the enclosure is greater than 240VAC. In this case, a
step-down transformer is needed.
• The noise on the AC line is outside the suggested operating range of the equipment
connected to the AC line. In this case, an isolation transformer and/or line filter may be
required.
L3
L1
L2
EARTH
GROUND
3 PHASE ISOLATION TRANSFORMER
PRIMARY
DISTRIBUTION PANEL
L3
L1
L2
EARTH
GROUND
3 PHASE ISOLATION TRANSFORMER
DISTRIBUTION PANEL