Proportional Action (P-Action) - Mitsubishi Electric MELSEC-Q Series User Manual

1 OVERVIEW

1.3.3 Proportional action (P-action)

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(1) The proportional action calculates the manipulated value proportional to the
deviation (difference between the set value and measured value).
(2) With the proportional action, the relationship between the changes in the deviation
and manipulated value can be expressed in the following formula:
MV = K E
P
Kp is a proportional constant and is called the proportional gain.
(3) Figure 1.7 shows the proportional action for the step response with a constant
deviation.
(4) The manipulated value changes between -5.0% and 105.0 %.
As the Kp increases, the manipulated value for the same deviation becomes larger,
and the corrective action becomes stronger.
(5) The proportional action will generate an offset (residual deviation).
Fig. 1.7 Proportional action for step response
MELSEC-Q
E
Time
K E
P
Time
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