Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022 7
Preface
About This Publication
An increasing number of drive systems in a wide range of applications and power ranges are being configured today in common bus
configurations. These system configurations provide significant advantages, such as design flexibility, higher efficiency, and cost savings.
It’s the objective of this publication to provide the necessary guidelines, considerations, and limitations for the proper application of Allen-Bradley®
drives used in common bus configurations. For Allen-Bradley common bus standard products, see the Common DC Bus Selection Guide, publication
DRIVES-SG001
.
There are many possible common bus configurations that are beyond the scope of this document. If your configurations aren’t covered by this
manual, contact your authorized Rockwell Automation distributor or Rockwell Automation representative. Rockwell Automation Systems and
Solutions business can accommodate unique or more complex common bus configurations.
This publication is focused on Common Bus configurations that are powered from electrical power grid sources. If your application is powered by
isolated power sources, such as backup or marine shipboard generators, contact your authorized Rockwell Automation distributor or Rockwell
Automation representative for assistance.
Download Firmware, AOP (Add-on Profile), EDS, and Other Files
Download firmware, associated files (such as AOP, EDS, and DTM), and access product release notes from the Product Compatibility and Download
Center at rok.auto/pcdc
.
Definition of Common Bus Configuration
This configuration contains one or more common bus inverters that are connected directly to the DC common bus. The common DC bus allows
connected inverters to share energy directly on the DC bus, providing an efficient way for motoring inverters to absorb energy from regenerating
inverters. A PowerFlex® 755TM non-regenerative bus supply can be used to supply DC power to the DC input common bus inverters where it’s
determined that there’s no regeneration to the AC power source.
If regeneration to the AC source is required, the PowerFlex 755TM regenerative bus supply (using active front end (AFE) pulse-width modulated
(PWM) insulated gate bipolar transistor (IGBT) converter topology) enables bidirectional power flow from and back to the incoming AC line.
In addition, standard PowerFlex 755TL/TR AC drives can be used in a shared or piggy-back common DC bus configuration, where one non-
regenerative or regenerative AC drive is used to power a motor load plus other DC input inverters, which are connected to the DC bus terminals.
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