18 The Process Variable jumps around, quite a bit. Which of the PID settings should we not be using, to improve controllability, and extend the life of our Final Control Element? Explain how Open Loop Tuning differs from Closed Loop Tuning. Student answer Ziegler-Nichols Open Loop Tuning Often, when working with a faster loop, many people will opt only for a Pl control philosophy. Looking at the following graph, calculate PI parameters the you would use (bearing in mind that one often has to fine tune, slightly, afterwards, just to ensure you get the results you want)