ABB Relion REC615, Техническое руководство

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Table 54: 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
Pt250
Ni100
Ni120
Ni250
Cu10
Selection for RTD inputs, when temperature sensor is used. All the select-
able sensor types have their resistance vs. temperature characteristics
stored in the module; default measuring range is -40...200°C.
3.13.2.2 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.
3.13.2.3 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.
Basic functions 1MRS758755 C
100 REC615 & RER615
Technical Manual