Anti-reset windup

What it means

Anti-reset windup holds or unwinds the integral term whenever the output is saturated, so that the controller comes off the limit as soon as the error reverses rather than some time afterwards.

Every modern control system implements it, and the setting is frequently just not enabled — particularly on loops that were never expected to saturate and then started doing so after a process change. That is the pid anti windup configuration to check before blaming the constants.

Questions that come up

What is anti-reset windup?

Anti-reset windup stops integral action accumulating while the output is at a limit, so the controller comes off the limit as soon as the error reverses rather than some time afterwards. Check it before you blame the constants: a saturated PID overshoots on recovery when this is off.

Related

Where this comes up

• PID output stuck at 0% or 100%
• Control loop will not hold setpoint
• Overshoot after a setpoint change
• Integral windup symptoms
• Won't transfer to AUTO
• Integral windup
• Bumpless transfer
• Override (selector) control