ABB RELION REX640 Technical Manual page 175

1MRS759142 F
"Degrees celsius"
Figure 69: Pt100 scaling function
Scaling example 2
Input mode is set to –20...20 mA that is used for tap position information fed from
the tap changer. The tap positions are between –36...36. Thus, the scaling setting
Value minimum is set to "–36" and Value maximum is set to "36". These settings
apply the input scaling to the output. In the tap position case, the
be set to "Dimensionless".
Value maximum
"Dimensionless"
Value minimum
Figure 70: Tap changer position from mA input
Scaling example 3
When
example, the desired function output is a ratio in a function of resistance. If the
input resistance varies between 100...1600 ohms,
Input maximum is set to "1600". As the wanted output should be in percents, the
setting
output scaling is enabled. Thus,
is set to "100". These settings allow the input values to be scaled as a ratio of the
resistance range.
REX640
Technical Manual
AI_VAL
200 °C
Value unit
-40 °C
AI_VAL
36
Value unit
-36
4 mA
Input minimum
Input mode is set to "Resistance", the output can be scaled as desired. For
Value unit is set to "Dimensionless". When Input mode is set to "Resistance",
Input mode
"Pt100"
Input mode
"-20..20mA"
Input minimum is set to "100" and
Value minimum is set to "0" and Value maximum
Basic functions
Input
Value unit should
Input
20 mA
Input maximum
175