Deadband Supervision - ABB RELION Series Technical Manual

1MRS758755 A
3.12.2.8
REC615 and RER615
Technical Manual
Table 37: Settings for X130 (RTD) analog input limit value supervision
Function
X130 (RTD) analog input
When the measured value exceeds either the Value maximum setting or the Value
minimum setting, the corresponding quality is set to out of range and a maximum or
minimum value is shown when the measured value exceeds the added hysteresis,
respectively. The hysteresis is added to the extreme value of the range limit to allow
the measurement slightly to exceed the limit value before it is considered out of range.

Deadband supervision

Each input has an independent deadband supervision. The deadband supervision
function reports the measured value according to integrated changes over a time
period.
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Figure 35: Integral deadband supervision
The deadband value used in the integral calculation is configured with the Value
deadband setting. The value represents the percentage of the difference between the
maximum and minimum limits in the units of 0.001 percent * seconds. The reporting
delay of the integral algorithms in seconds is calculated with the formula:
( Value maximum Value minimum
t s ( )
=
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Settings for limit value supervision
Out of range
High-high limit
High limit
Low limit
Low-low limit
Out of range
deadband
)
− ⋅
Y
∆
Section 3
Basic functions
Value maximum
Val high high limit
Val high limit
Val low limit
Val low low limit
Value minimum
s
100000
(Equation 3)
91