Danfoss VLT AAF00x Instruction Manual page 37

How to Install
4 4
PCC1
PCC2
Figure 4.30 Current transformers installed in front of the entire
installation and filter compensate all loads on the transformer
(CT on PCC side).
4-24
VLT Active Filter AAF 00x
AAF
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MG.90.V2.22 - VLT
PCC1
PCC2
Figure 4.31 Current transformers are installed in front of distri-
bution bus 2 and 1,Adjustable frequency drive and the filter
only compensates currents for those (CT on load side).
If the CTs are installed on the secondary side of the
transformer and thus in front of the entire load, the filter
will compensate all loads simultaneously. If, as in
Figure 4.31, the CTs are installed in front of only some of
the loads, the filter will not compensate unwanted current
deformation of the Adjustable frequency drive and motor
on the right hand side. If CTs are installed in front of a
single load, the filter will only compensate the one load
and so form individual load compensation.
The filter can be programmed to have CTs installed on
source side also called Point of Common Coupling (PCC) or
alternatively at the load side. This must be programmed
via 300-26 CT Placement
®
is a registered Danfoss trademark
AAF
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