ABB Relion REC615, Техническое руководство

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Function Settings for limit value supervision
Low limit
Val low limit
Low-low limit Val low low limit
Out of range Value minimum
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.
3.13.2.8 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.
Figure 34: 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:
t s
Y
( )
( )
=
− ⋅
Value maximum Value minimum
deadband
s
100000
∆
(Equation 3)
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
1MRS758755 C Basic functions
REC615 & RER615
Technical Manual
103