Selection Of Output Value Format; Input Linear Scaling - ABB RELION Series Technical Manual

Section 3
Basic functions
3.12.2.2
3.12.2.3
88
Table 35: Limits for the RTD/mA inputs
Input mode Description
Not in use Default selection. Used when the corresponding input is not used.
0...20 mA Selection for analog DC milliampere current inputs in the input range of 0...20 mA.
Resistance Selection for RTD inputs in the input range of 0...2000 Ω.
Pt100 Selection for RTD inputs, when temperature sensor is used. All the selectable
Pt250 sensor types have their resistance vs. temperature characteristics stored in the
Ni100 module; default measuring range is -40...200°C.
Ni120
Ni250
Cu10

Selection of output value format

Each input has independent Value unit settings that are used to select the unit for the
channel output. The default value for the Value unit setting is "Dimensionless". Input
minimum and Input maximum, and Value maximum and Value minimum settings have
to be adjusted according to the input channel. The default values for these settings are
set to their maximum and minimum setting values.
When the channel is used for temperature sensor type, set the Value unit setting to
"Degrees celsius". When Value unit is set to "Degrees celsius", the linear scaling is not
possible, but the default range (-40...200 °C) can be set smaller with the Value
maximum and Value minimum settings.
When the channel is used for DC milliampere signal and the application requires a
linear scaling of the input range, the Value unit setting value has to be
"Dimensionless", where the input range can be linearly scaled with settings Input
minimum and Input maximum to Value minimum and Value maximum. When
milliampere is used as an output unit, Value unit has to be "Ampere". When Value unit
is set to "Ampere", the linear scaling is not possible, but the default range (0...20 mA)
can be set smaller with the Value maximum and Value minimum settings.
When the channel is used for resistance type signals and the application requires a
linear scaling of the input range, the Value unit setting value has to be
"Dimensionless", where the input range can be linearly scaled with the setting Input
minimum and Input maximum to Value minimum and Value maximum. When
resistance is used as an output unit, Value unit has to be "Ohm". When Value unit is
set to "Ohm", the linear scaling is not possible, but the default range (0...2000 Ω) can
be set smaller with the Value maximum and Value minimum settings.

Input linear scaling

Each RTD/mA input can be scaled linearly by the construction of a linear output
function in respect to the input. The curve consists of two points, where the y-axis
(Input minimum and Input maximum) defines the input range and the x-axis (Value
minimum and Value maximum) is the range of the scaled value of the input.
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Technical Manual