ABB ACS850 series, Инструкция по применению

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19
Supply unit selection
DC link power supplied via the drive
The DC link power can be supplied via a suitable drive module for the common DC
system. The drive module will be selected based on
P
mot,ave
and
P
mot,max
requirements,
and charging circuit capacity requirements. In frames E0, E and G the charging circuit
of the connected module must be able to withstand the total charging energy E
tot
.
Single AC input (frames A…D)
In the optimum situation, only one drive module is connected to the AC supply and the
other drive modules are supplied via DC link. The following conditions must be fulfilled:
•
P
mot,ave
< P
rec,ave
•
P
mot,max
< P
rec,max
If the conditions cannot be fulfilled, either a drive module with higher
P
rec
ratings can be
selected (if feasible) or a multiple AC input configuration can be used.
Single AC input frames E0…G
To determine whether it is possible to leave other converters unconnected to the main
supply see chapter
Checking the charging circuit capacity . The following conditions
must also be fulfilled:
•
P
mot,ave
< P
rec,ave
•
P
mot,max
< P
rec,max
•
E
tot
< E
rconnected
Multiple AC input
To determine whether it is possible to leave some converters unconnected to the main
supply see chapter
Checking the charging circuit capacity .
If two or more drive modules are connected to the AC supply, the same conditions as
above must still be fulfilled:
•
P
mot,ave
< P
rec,ave
•
P
mot,max
< P
rec,max
•
E
tot
< E
rconnected
Where
P
rec
ratings are now calculated from the individual ratings as follows:
•
P
rec,ave
= P
rec,ave1
+ k(P
rec,ave2
+ P
rec,ave3
+…. )
•
P
rec,max
= P
rec,max1
+ 0.9k(P
rec,max2
+ P
rec,max3
+…. )
P
rec,ave1
and
P
rec,max1
are are the values of the drive module with the highest power
ratings. It is recommended that the parallel connected units are the same size.
Common DC configurations