Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) Commissioning - ForGe Control - Manual (Page 13)

Rockwell Automation Publication 7000-IN012B-EN-P - June 2014 13
PowerFlex 7000 Overview Chapter 2
Figure 2 - 3300/4160V Direct-to-Drive (transformerless AFE rectifier)
AFE Rectifier with Separate Isolation Transformer
For applications when the line voltage is higher than the motor voltage, a
transformer is required for voltage matching. In this case, providing an AFE
rectifier with a separate isolation transformer is ideal. The isolation transformer
provides the input impedance (replaces the requirement for an integral line
reactor) and addresses the common mode voltage (replaces the requirement for a
CMC that is supplied in the Direct-to-Drive rectifier configuration). However,
the AFE rectifier, its operation, and advantages are the same as the Direct-to-
Drive configuration.
Figure 3 - 3300/4160 AFE Rectifier with separate isolation transformer
SGCTs
LINE CONVERTER OMMON MODE CHOKE C
L+ M+
SGCTs
MACHINE CONVERTER
U (T1)
V (T2)
W (T3)
L- M-
LR
SGCTs
LINE CONVERTER DC LINK
L+ M+
SGCTs
MACHINE CONVERTER
U (T1)
V (T2)
W (T3)
L- M-
2U (X1)
2V (X2)
2W (X3)
1U
1V
1W
ISTX
REMOTE