(1)
If the setting
Range active
is set to
test
, the setting
Transformation ratio
is not
displayed.
(2)
If the setting
Range active
is set to
false
, the settings
Upper limit
,
Transformation
ratio upper limit
,
Lower limit
and
Transformation ratio
are not displayed.
Measured-Value Calculation
The function 20-mA channel processes a single 20-mA current signal supplied by the 20-mA unit of the corre-
sponding channel. The 20-mA current measured value is converted into the correct physical quantities such as
temperature or pressure. In each 20-mA functional unit (Ether. and serial) there are always 12 of the 20-mA
channel function blocks, even if fewer channels are connected with the 20-mA unit. The calculated values are
available for further processing via CFC, GOOSE, protocols, and the display image.
Measured-Value Processing
The 20-mA unit typically transmits a value which represents a physical quantity, such as a temperature or a
pressure. Therefore, the device must contain a characteristic curve that maps the physical quantity to the 20-
mA value. If you do not activate the
Range active
setting (no x in the check box), the function operates
over the range 0 mA to 20 mA. If a value smaller than 0 mA or greater than 20 mA is active at the input of the
20-mA unit, the measured value is identified as invalid. The setting of the range for the scaled value goes from
a usable range of 0 mA to 20 mA. The following figure shows an example.
[sckanumw-190214-01, 1, en_US]
Figure 5-57
Settings for Example 1
In this example, the measured value 0 mA means a temperature of 0 °C and the measured value 20 mA means
a temperature of 100 °C. So enter as
Unit
=
°C
and
Conversion factor
=
100
. The resolution (decimal
place) of the temperature value can be chosen; for a decimal place, select
Resolution
=
0.1
.
[dwknges3-020513-01.tif, 1, en_US]
Figure 5-58
Characteristic Curve of a 20-mA Input (Example 1)
Function-Group Types
5.7 Function-Group Type Analog Units
258
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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