Configuration Steps - ABB ACS850 Application Manual

Sample
configuration 2
Unequal current distribution and different charging methods cause difficulties to
common DC systems:
Unequal current distribution is influenced by input cables, AC or DC chokes and
•
input bridges' forward characteristics. If the voltage reduction over the supply
components mentioned is not the same with all converters, more current will flow
through the converter which has a lower voltage reduction. Factors which influence
the current distribution include temperature, tolerances of components and in DC
choke cases the input cable's cross-sectional area and length.
Charging methods vary depending on the converter size. Because of this in some
•
installations, the supplies of the frame sizes A-D should be disconnected when they
are connected parallel with frame sizes E0, E and G.
Note: The drive compliance with the EMC Directive on low voltage networks is
specified in the appropriate Hardware Manual. However, please notice that different
common DC configurations have not been tested according to the EMC requirements
of conducted and radiated emissions.

Configuration steps

Here is a simple flowchart for configuring a common DC system. Each configuration
step is described in more detail in the related sections.
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M
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M
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M
Common DC configurations
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