Common Dc Configurations; Introduction - ABB ACS850 Application Manual

12

Common DC configurations

Introduction

Drive modules can be connected together via DC terminals to have a so called
common DC configuration. Within common DC, the drives with regenerative power
from the motor can via DC link feed the other drives that are on the motoring mode.
The major benefits with this kind of connection are the following:
Energy saving due to a reduced need for the supply side power. In optimum case,
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there is also no need for braking resistors if the simultaneous regenerative power is
not higher than the motoring power.
A DC link energy storage can be used for short dynamic braking energy pulses to
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avoid the need for an external braking resistor.
Braking energy can be handled with one unit even if several drives are in the
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regenerative mode at the same time. However, several units with an active braking
chopper can be used simultaneously with the braking resistor if needed.
Possibility for one AC input connection. The selected unit, in addition to its own axis
•
power, feeds also other drives connected to the common DC.
Sample
configuration 1
Common DC configurations
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M M
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M
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M