Rockwell Automation 20Y PowerFlex Active Front End - Manual (Page 18)

18 Rockwell Automation Publication 20Y-UM001E-EN-P - July 2014
Preface
Benefits of the AFE The PowerFlex Active Front End provides the following benefits:
• Energy Savings with Regenerative Braking—instead of wasting energy
with resistor braking technology, regenerative braking actually puts the
energy back into the system to be used by other equipment.
• Low AC Input Harmonics—the active front end provides low harmonics
to meet IEEE 519 and CE at its input terminals.
• Improved Power Factor—the AFE actively controls the power factor
regardless of motor speed and load. In addition, the PowerFlex AFE can be
used for power factor correction on the power system.
• Voltage Boost—the AFE provides the ability to boost the DC voltage. See
Voltage Boost on
page 153 for guidelines regarding voltage boost. This
voltage boost also helps protect critical processes from the potentially
disruptive effects of input voltage dips and sags.
ATTENTION: The PowerFlex Active Front End can be used for voltage boost, but
cannot be used to lower the DC bus voltage. The minimum DC bus voltage is
limited by the rectified diode bridge voltage.