ABB RELION REX640, Техническое руководство, Страница: 177 / 1960

Value unit Hysteresis
Degrees Celsius 0.5°C
Ohm 2 Ω
Hysteresis
Value maximum Value minimum
Input maximum Input
⋅
−
−
m minimum
(Equation 7)
Example
Ampere input –20…20 mA is scaled to tap position information 0...36. The
actual hysteresis for limit supervision is 0.18.
X_RANGE= 1
X_RANGE = 3
X_RANGE=0
Hysteresis
Val high high limit
Val high limit
Val low limit
Val low low limit
X_RANGE=2
X_RANGE=4
Y
t
X_RANGE=0
Value
Reported
Value maximum
Value minimum
Out of Range
Figure 72: Limit value supervision
3.15.4.3 Deadband supervision
This is the same functionality as in measurement functions.
3.15.4.4 Output scaling
The mA outputs are scaled linearly by constructing linear scaling curves for each
output.
Value maximum and Value minimum affect the scaled output range. The range of
the scaled input is defined with the settings Input minimum and Input maximum.
Depending on setting Num of knee points, the output can be scaled with up to five
1
When the input is scaled to the "Dimensionless" output, the additional hysteresis is added the
initial table value.
1MRS759142 F Basic functions
REX640
Technical Manual
177