Question

Q17. With a sketch explain what is the difference between REAL as opposed to IDEAL algorithms? When would you choose between REAL as opposed to IDEAL algorithms?                                                                                                                                                                                

Q21. Does a FEED FORWARD controller have PID settings?       

Answer 1

The ideal PID-controller is not suitable for direct field interaction, therefore it is called the non-interactive PID-controller. It is highly responsive to electrical noise on the PV input if the derivative function is enabled.

The real PID-controller is especially designed for direct field interaction and is therefore called the interactive PID-controller. Due to internal filtering in the derivative block the effects of electrical noise on the PV input is greatly reduced.

INTERACTIVE PID

The oldest controller algorithm is called the Series, Classical, Real or Interactive algorithm. The original pneumatic and electronic controllers had this algorithm and it is still found it in many controllers today.  The Ziegler-Nichols PID tuning rules were developed for this controller algorithm.

NON INTERACTIVE PID

The Noninteractive algorithm is also called the Ideal, Standard or ISA algorithm. The Cohen-Coon and Lambda PID tuning rules were designed for this algorithm.