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= Key 1
= Key 2
= Key 3
= Maximum or consumption = Minimum or supply.
In UMG503 almost all measured values are available in
floating point format (Table 2). For the transmission of
measured values, the floating format values are changed
into integer formats by UMG 503, such as char, int and
word (Table 4).
In order not to lose a digit after decimal point, the
transmitted value is scaled. The transmission value is
calculated as follows:
Measured value = Transmission value * Factor
The scales of the measured values are calculated from
UMG 503 out of current and voltage transformer ratio.
Here the minimum definition of the transmitted value of
0,1% is strived for.
The scales of the UMG 503 can be retrieved under the
following addresses:
Example: Scale
Transmitted value UMG 503
= 2301
Programmed scale
= -1
Which voltage is measured by the UMG 503?
From the scale table, you can read the factor =/10 for
scale=-1:
Measured value = Transmitted value *
Factor
Measured value = 2301 * 1/10
Measured value = 230,1V
The measured voltage is 230,1V.
Measured values
Index Address
dez
r/w
1)
Format
Possible scale
Current
200
9100
r
word
-3 .. 6
Voltage
201
9101
r
word
-3 .. 6
Power
202
9102
r
word
-3 .. 6
cos(phi)
203
9103
r
word
-3
Frequency
204
9104
r
word
-2
THD
205
9105
r
word
-3
10 scale factors are at your disposal:
Scale
Factor
-3
/1000
-2
/100
-1
/10
0
* 1
1
* 10
2
* 100
3
* 1 000
4
* 10 000
5
* 100 000
6
* 1000 000
The scale of energy is fixed by the scale of power
1)
r/w = read/write
Table 8
Scale of measured values, which can be retrieved in integer format.
