What is the point of using this derived PID controller?

1. What is the purpose of derivative in PID controller?
2. What is the advantage of derivative controller?
3. When would you use a derivative controller?

What is the purpose of derivative in 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 the advantage of derivative controller?

The major advantage of derivative controller is that it improves the transient response of the system.

When would you use a derivative controller?

We recommend using derivative only if the derivative function contains a built-in filter to remove high frequency noise. Most DCSs and PLCs have this function but some do not or there is a switch to activate the derivative filter.