An introduction to the concept of PID control loops. Using a simple level control loop this model demonstrates the basic principles of process control. The model can be used to develop an understanding of each of the components of the PID controller, the proportional, integral and derivative terms. By allowing a variable feed to the level controlled system it is then possible to tune the response of this controller to various conditions, this is explained in a set of assignments contained within the model.
A simulation of basic three-term control as applied within a level control loop, which allows a fundamental introduction to proportional, integral and derivative control functions. The model may be used for whole class teaching at a basic level, or for trainees individually by using measurement of Ultimate Gain and Period to calculate the tuning constants using the Zeigler Nichols formulae.
The model may also be used to show many other aspects, including the effect of liquid head on flow, and the way in which the valve size affects the available range of the control system.
The model includes a full User Guide, Assignments, and Trend Charts
The graphic above is a screen shot with the 'Trend Chart' tab selected and showing the Controller tuning pop-up. flow can be changed from high to low simply by clicking on the relevant button. Similarly, Set Point, Gain etc can be changed by clicking on the screen and typing in the new value.
