Technical data
95
3ADW000194R0611 DCS800 Hardware Manual f us
Layout of the SDCS-PIN-51 board
Measuring board SDCS-PIN-51
This board is always used together with SDCS-PIN-4x board. On this
board there are the circuits located needed for current, voltage and
temperature measuring and for hardware coding.
The current is measured by current transformers at the main AC
inputs, rectified by a diode bridge and scaled with burden resistors.
The nominal current is adjusted by cutting out resistors (R1 ... R21)
from the board according to the current coding table. The resistors
R22 ... R26 are used for the current equal to zero detection. These
resistors must be cut off too, according to the current coding table.
Voltages (U1, V1, W1 and C1(+) and D1(-)) are measured by using
high ohm resistor chains. Scaling of AC and DC voltage is done by
activating 1 MΩ resistors (= cutting out short circuit wires, which are
represented by low ohmic resistors).
The voltage measurement uses 5 resistor:
U1:W1 to W5
V1:W6 to W11
W1:W12 to W16
C1(+):W17 to W21
D1(-):W22 to W26
If there is a need for voltage adaptation, all 5 chains must be han-
dled in the same way.
Note! Actual voltage signals U1, V1, W1, C1(+) and D1(-) of the
main circuit are not galvanically isolated from the control board.
Because of that a current of less than 1 mA will flow to earth.
When galvanically isolated measurement is needed, please contact
your ABB representative..
X413
X313
X213
X113
X513
X13
S2 S1
X23 X24 X25
R1 . . . . . . . R21
X12S
X13S
X413S
X313S
X22 X122
X12
U1
V1
W1
D1
C1
W5 W4 W3 W2 W1
W16 W15 W14 W13 W12
W26 W25 W24 W23 W22
W11 W9 W8 W7 W6
W21 W20 W19 W18 W17
W5
R123
R22
R26
1
2
22
11
SDCS-PIN-51
S3
W10
W70
W80
W71
W81
W72
W82
W83
305
100
21
3
4
PTC
Conductive
supports
Isolating
supports
One PTC
Two PTC
line potential !
see diagram
power part
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