Integral Action (I-Action) - Mitsubishi Electric MELSEC Q Series User Manual

1 GENERAL DESCRIPTION

1.3.4 Integral action (I-action)

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(1) The integral action is an action which continuously changes the manipulation value
to eliminate the deviation when there is a deviation.
The offset produced by the proportional action can be eliminated.
(2) In the integral action, the time from the deviation occurrence until the manipulation
value of the integral action becomes that of the proportional control action is called
the integral time, and is indicated by T
(3) The integral action for the step response when the error value is constant is shown
in Figure 1.9.
(4) The integral action is used as a PI action in combination with the proportional action,
or PID action in combination with the proportional and derivative actions.
The integral action cannot be used alone.
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I
E
Time
Manipulated value of the Proportional
action + Integral action
Manipulated value of the Integral
action
Manipulated value of the Proportional
K E
P
action
T
I
Time
Fig. 1.9 Integral action for step response
MELSEC-Q
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