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

1 OVERVIEW

1.3.4 Integral action (I-action)

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(1) When a deviation occurs, the integral action continuously changes the manipulated
value to eliminate the deviation.
The offset produced by the proportional action can be eliminated.
(2) In the integral action, the time from the deviation occurrence until the manipulated
value of the integral action becomes that of the proportional control action is called
the integral time, and is indicated by T
(3) Figure 1.8 shows the integral action for the step response with a constant deviation.
(4) The integral action is used in the PI action in combination with the proportional
action, or the PID action in combination with the proportional and derivative actions.
The integral action cannot be used alone.
.
I
E
Time
K E
P
T
I
Time
Fig. 1.8 Integral action for step response
MELSEC-Q
Manipulated value of the Proportional
action + Integral action
Manipulated value of the Integral
action
Manipulated value of the Proportional
action
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