25
Hardware
3ADW000197R0101 DCS800-R Sel e a
If the ratio of the current transformer is different to 2500:1 or 4000:1
Calculate the total burden resistance R
br
:
roct
I
V
R
dN
br
*
5,1
=
Calculate the resistors to be cut off within R1 to R21 according to the next formula.
The resulting resistance R
r
should be as close as possible to the burden resis-
tance R
br
. If the resulting resistance R
r
is smaller than R
br
, the nominal current I
dN
(R
r
)
will be higher than the current the calculation was based on (keep the coding and
use the recalculated current at parameter S ConvScaleCur (97.02)):
RnRRRRR
br
1
.....
4
1
3
1
2
1
1
11
+++++=
Additional settings
The following settings will be done by software parameters:
Converter Parameter Parameter
no.
Settings Remarks
type code TypeCode (97.01) NONE
nominal current S ConvScaleCur (97.02) xxxxx (A) as coded
nominal voltage S ConvScaleVolt (97.03) xxx (V) as coded
power stack
temperature
monitoring
S MaxBrdgTemp (97.04) 60 (°C)
2-Q or 4-Q mode S BlockBridge2 (97.07) 1
2
at 2-Q power part
at 4-Q power part
with: I
dN
= nominal current of power part
roct = ratio of current transformer
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