Answer / Parvez Aalam

Reverse PID action in Proportional-Integral-Derivative (PID) controllers occurs when the controller behaves counterintuitively, i.e., increasing the output to reduce the error instead of decreasing it. This can happen due to improper tuning of the PID parameters or non-linear process dynamics. Drawings illustrating this concept would show the relationship between input, error, and output for both normal and reverse action PID controllers.

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