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1 GENERAL DESCRIPTION
1.3.3 Proportional action (P-action)
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(1) The proportional action is an action to obtain the manipulation value proportional to
the deviation (difference between set value and process value).
(2) With the proportional action, the relationship between the changes in the deviation
and manipulation value can be expressed in the following formula:
MV =
K
E
P
where Kp is a proportional constant and is called the proportional gain.
(3) The proportional action for the step response when the error value is constant is
shown in Figure 1.8.
(4) The manipulation value changes between -5.0% and 105.0 %. As the Kp
increases, the manipulation value for the same error value becomes larger, and the
corrective action becomes stronger.
(5) The proportional action will generate an offset (remaining deflection).
Fig. 1.8 Proportional action for step response
MELSEC-Q
E
Time
K
E
P
Time
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