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14
Supply unit selection
DC link power supplied via ACSM1
The DC link power can be supplied via a suitable ACSM1 drive module for
the common DC system. The drive module will be selected based on
P
mot,ave
and
P
mot,max
requirements.
Single AC input
In the optimum situation only one ACSM1 drive module is connected to 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 can not 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.
Multiple AC input
In case 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
where
P
rec
ratings are now calculated from the individual ratings as follows
•
P
rec,ave
=
P
rec,ave1
+ 0.8 x (
P
rec,ave2
+
P
rec,ave3
+…. )
•
P
rec,max
=
P
rec,max1
+ 0.7 x (
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.