Deadband Supervision - ABB RELION 620 Series Technical Manual

1MAC504801-IB E
3.11.2.8
620 series ANSI
Technical Manual

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 33: 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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Example of X130 (RTD) analog input deadband supervision
Temperature sensor Pt100 is used in the temperature range of 15...180 °C. Value unit
"Degrees Celsius" is used and the set values Value minimum and Value maximum are set
to 15 and 180, respectively.
Value deadband = 7500 (7.5% of the total measuring range 165)
AI_VAL# = AI_DB# = 85
If AI_VAL# changes to 90, the reporting delay is:
o o
( 180 C 15 C ) 7500
− ×
t s ( )
=
o o
90 C 85 C
−
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deadband / 1000
×
Y 10 0 0%
∆ ×
% / s 1000
2 5 . s
≈
100 %
×
Section 3
Basic functions
(Equation 1)
(Equation 2)
103