ABB RELION REX640 Technical Manual page 167

1MRS759142 C
REX640
Technical Manual
"Dimensionless". The Input minimum, Input maximum, Value maximum and Value
minimum settings have to be adjusted according to the input channel and if Value unit
is changed.
When the RTD channel input is used for the temperature sensor type, the Value unit
setting needs to be changed to "Degrees Celsius". When Value unit is set to "Degrees
Celsius", linear scaling is not applied but the default range (-40...200°C) can be
decreased with the Value maximum and Value minimum settings.
When the DC milliampere signal is connected to the mA channel and the application
requires a linear scaling of the input range, the Value unit setting value has to be set to
"Dimensionless" so that the input range can be linearly scaled with the settings Input
minimum and Input maximum to Value minimum and Value maximum. When
milliampere is used as a value unit, Value unit has to be "Ampere". When Value unit
is set to "Ampere", the default range (-20...20 mA) can be decreased with the Value
maximum and Value minimum settings.
When a resistance type signal is connected to the RTD channel and the application
requires a linear scaling of the input range, the Value unit setting value has to be set to
"Dimensionless" so that the input range can be linearly scaled with the settings Input
minimum and Input maximum to Value minimum and Value maximum. When
resistance is used as a value unit, Value unit has to be "Ohm". When Value unit is set to
"Ohm", the default range (0...4000 Ω) can be decreased with the Value maximum and
Value minimum settings.
RTD temperature vs. resistance
The resistance values of temperature sensors at specified temperatures are given in
Table 83.
Table 83: Temperature vs. resistance
Temp Platinum TCR 0.00385
°C Pt 100
-40 84.28
-30 88.22
-20 92.16
-10 96.09
0 100.00
10 103.90
20 107.79
30 111.67
40 115.54
50 119.40
60 123.24
70 127.08
80 130.90
90 134.71
Table continues on next page
Nickel TCR 0.00618
Pt 250 Ni 100
210.70 79.13
220.56 84.15
230.40 89.30
240.21 94.58
250.00 100.00
259.76 105.55
269.48 111.24
279.18 117.06
288.85 123.01
298.49 129.11
308.10 135.34
317.69 141.72
327.24 148.25
336.77 154.93
Section 3
Basic functions
Ni 120 Ni 250
94.96 197.83
100.97 210.36
107.16 223.24
113.50 236.45
120.00 250.00
126.66 263.88
133.48 278.09
140.47 292.64
147.61 307.53
154.93 322.76
162.41 338.35
170.06 354.30
177.90 370.63
185.92 387.34
161