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Rockwell Automation Publication 6000-UM002G-EN-P - August 2022
Chapter 2 Drive System Layout
Figure 16 - Isolation Transformer Primary and Secondary Winding Orientation
The secondary windings are brought out to corresponding vertical isolated
stand-offs on the body of the transformer (orientated U, V, and W from left to
right as viewed from the front).
The U/W/V phase interconnections to the isolation transformer secondary
windings are all on the front of the isolation transformer. The power cable
connections to the power modules are made at the factory.
For H-frame and B-frame drives, the field power cable connections must be
made at the isolation transformer secondary winding termination points
because the isolation transformer cabinet and power module cabinet are
shipped separately (see publication
).
For A-frame drives, the field power cable connections are already terminated
when the drive arrives at the site.
Isolation Transformer Temperature Monitor
A discrete transformer temperature monitor is mounted on the LV door in the
isolation transformer cabinet. There are two types of transformer temperature
monitors, and the type that is used depends on the drive rating. Three
temperature sensors are embedded in the isolation transformer. The monitor
can be set to indicate an alarm condition or a trip condition, dependent on the
temperature detected.
PRIMARY WINDING INPUT
SECOND
AR
Y W
INDING OUTPUT
A (L1)
B (L2)
C (L3)
U
V
W
SECOND
AR
Y W
INDING OUTPUT
U
V
W