Signals & Analog

PID

Proportional-Integral-Derivative

Definition

A control algorithm that adjusts an output based on the size of the current error, the accumulated error over time, and the rate the error is changing.

Proportional reacts to how far off you are; integral reacts to how long you have been off and removes the residual offset; derivative adds damping and amplifies noise.

Most pump and pressure loops in water and wastewater run well on proportional and integral only.

PID Control for Pumps and ValvesWhat each term actually does, how to tune a loop on a real pump station, and the handful of mistakes that cause most of the oscillation people blame on tuning.

PID

Definition

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