Rockwell Automation 1395 Digital DC Drive - Manual (Page 60)

Publication 2361-5.01 July 1998
5-6 Installing Your Drive
Figure 5.2
Power Connections–Standard Field Voltage
Field Transformer
For high-horsepower units with a 575 or 660V AC input, the field
supply requires a transformer to step down the voltage to 460V.
Figure 5.3 shows the typical transformer wiring scheme.
Figure 5.3
Field Transformer
A1 A2
M
F2 - F1 +
D C M otor
S hunt Field
TB 7
3 2 1
L3 L2 L1
3-P hase
D isconnect
D C M otor
Arm ature
A2 - A 1+
575 or
660V
H1
H2
X1
X2
460V
1L1
1L3
TB8
1
2
3
To Field
Bridge
Typical Transformer Arrangement
(used for 575V AC inputs or greater)
F20
F21
Field Transformer Enclosure