SAMWONTECH
2nd Edition of TEMP2000M_Series IM : April. 8. 2014 Page 101 / 176
12.1.2.3 Over-Integral Prevention
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It is one of efficient method to control when disturbance occurs.
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This function suppresses overshoot due to over-integral when control output reaches to max value.
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It does not work when I=0 at PID set value.
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When there is no Over-Integral Prevention(ARW) function.
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It takes time to dissolve the accumulated integral term even Disturbance is released, and
cause big Overshoot, and take time for NPV to be stable.
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When there is Over-Integral Prevention(ARW) function
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Reverse calculate the integral term until NPV enters ±P BAND, and reduce the integral term
dissolve time after disturbance released. It reduces Overshoot, and NPV is stabilized quickly.
Target SP
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▲
NPV starts decreasing by external shcok
Then, it makes MV increase and reach to
the peak point 100% output generating
In spite of clearing disturbance,
MV should be lasting 100% by
acumulative integral term
MV starts decreasing from
dissolving acumulatied
integral term.
Starting
Disturbance
Clearing
Disturbance
Breaking up
acumulated integral term
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Control Output (MV)
Control Output (MV)
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▲
Target SP
Current PV (NPV)
▲
NPV starts decreasing by external shcok
Then, it makes MV increase and reach to
the peak point 100% output generating
In spite of clearing disturbance,
MV should be lasting 100% by
acumulative integral term
Starting
Disturbance
Clearing
Disturbance
Breaking up
acumulated integral term
P BAND
MV starts decreasing from
dissolving acumulatied
integral term.
Inverse calculation by ARW
Current PV (NPV)
Summary of Contents for 3ch series
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