172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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This deviation between the Set value (SV) and the stabilized temperature is called
“Offset.”
With a narrower proportional band the control result becomes closer to that of the
ON/OFF control (oscillatory).
With a wider proportional band the output is gradually reduced to stabilize quicker,
however, often with a larger offset.
Refer to 8.6 Controlling with ON/OFF Action for ON/OFF action.
Integral action
Proportional action provides more
stable control than ON/OFF
control, but causes offset. This
offset can be automatically
corrected by Integral action.
As long as deviation exists
between the Set value (SV) and
the Measured value (PV), the
Manipulated output value (MV) is
added according to the size of the
deviation until no deviation exists.
The strength of the Integral action
is expressed in the Integral time.
The Integral time is the time till the
Manipulated output value (MV) by
the Integral action gets equal to
that by the Proportional action.
The shorter the Integral time, the
stronger the integral effect is, and
the longer the weaker.
Derivative action
The Derivative action allows the Manipulated output value (MV) proportional to the
changing rate (speed) of the Measured value (PV) to be produced to prevent a
fluctuation of the Measured value (PV) before it happens.
The strength of the Derivative action is expressed in the Derivative time. The
Derivative time is the time until the Manipulated output value (MV) by the Proportional
action gets equal to the Manipulated output value (MV) by the Derivative action when
the Measured value (PV) changes at a constant rate.
The longer the Derivative time is, the stronger the Derivative effect is, and the shorter
the weaker.
The Derivative effect, if set too strong, produces large Manipulated output (MV)
against a small change of the Measured value (PV), thus causing hunting and
resulting in unstable control.
Содержание SC-F71
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