Derivative time in pid controller

1. What is derivative time in PID?
2. What does derivative time do?
3. How does derivative work in a PID controller?
4. What is integral time and derivative time?

What is derivative time in PID?

More properly, a derivative describes the slope or the rate of change of a signal trace at a particular point in time. Accordingly, the derivative term in the PID equation above considers how fast, or the rate at which, error (or PV as we discuss next) is changing at the current moment.

What does derivative time do?

The time required when the derivative changes by a specific amount to obtain the same manipulated variable as for the proportional action when using only a derivative action. The longer the derivative time is, the stronger the derivative action will be.

How does derivative work in a PID controller?

Derivative acts as a brake or dampener on the control effort. The more the controller tries to change the value, the more it counteracts the effort. In our example, the variable rises in response to the setpoint change, but not as violently.

What is integral time and derivative time?

The correct terms are time integral (I) and time derivative (D) or derivative with respect to time. P represents the measurement of error. I represents the time integral of P; D is the derivative of P with respect to time. PID refers to corrections made to a process in order to stabilize it.