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K
Error
d
Future
Time
K
p
K
i
Present
Past
Figure 19-2: representation of the three actions.
19.1.5
Anti-Windup control (control of integral error)
The PID adjuster has an integral error control function called Anti-Windup.
This function is used when the demand of the PID reaches 100%. In this case, without the function, the integral action of the
controller would continue to integrate the error and render the PID adjuster inactive even if the error were to decrease in relation
to the setpoint, causing the system to overshoot. This would continue until the end of the integral period (time T
).
i
This function stops the calculation of the integral action until demand falls again below 100%.
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Version 38
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