Rockwell Automation Publication 7000-UM202D-EN-P - May 2018 17
PowerFlex 7000 Drive Overview Chapter 1
A small integral line reactor and capacitor addresses the high harmonic orders
(13th and above) and provides virtually sinusoidal input voltage and current
waveforms back to the distribution system. This configuration delivers
excellent line-side harmonic and power factor performance to meet IEEE 519-
1992 requirements and other global harmonic standards in virtually all cases.
This setup also provides a simple, robust power structure that maximizes
uptime by minimizing the number of discrete components and the number of
interconnections required.
A CMC mitigates the common mode voltage seen at the motor terminals, so
standard (non-inverter duty rated) motors and motor cables can be used. This
technology is ideal for retrofitting existing motor applications.
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 replaces the
requirement for an integral line reactor and 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
ISTXISTX
REMOTE
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