Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 15)

Rockwell Automation Publication 7000-UM202B-EN-P - June 2014 15
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 (indoor and outdoor
transformer versions are offered). 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 ISTX
REMOTE