Deadband Supervision; Output Scaling - ABB RELION REX640 Technical Manual

Section 3
Basic functions
3.15.4.3
3.15.4.4
166
Table 86: Pre-defined hysteresis values based on Value unit
Value unit
Dimensionless
Ampere
Degrees Celsius
Ohm
1) When the input is scaled to the "Dimensionless" output, the additional hysteresis is added the initial
table value.
Value maximum Value minimum
Hysteresis
⋅
Input maximum Input
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Example
Ampere input -20...20 mA is scaled to tap position information 0...36. The actual
hysteresis for limit supervision is 0.18.
Y
Value maximum
Val high high limit
Val high limit
X_RANGE=0
Val low limit
X_RANGE=2
Val low low limit
X_RANGE=4
Value minimum
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Figure 57: Limit value supervision

Deadband supervision

This is the same functionality as in measurement functions.

Output scaling

The mA outputs are scaled linearly by constructing linear scaling curves for each
output.
Hysteresis
Based on the scaling function
0.1 mA
0.5°C
2 Ω
−
m m inimum
−
Out of Range
X_RANGE = 3
Hysteresis
X_RANGE= 1
X_RANGE=0
1MRS759142 C
1)
(Equation 6)
t
Value
Reported
REX640
Technical Manual