PID Controller Response with different Input Signals
A very helpful method for understanding the operation of proportional, integral, and derivative control terms is to analyze their respective responses to the same input conditions over time. This section…
SIS Example : Nuclear Reactor Controls
Nuclear fission is a process by which the nuclei of specific types of atoms (most notably uranium-235 and plutonium-239) undergo spontaneous disintegration upon the absorption of an extra neutron, with…
Electronic Symbols
Periodic Table of Electronic Symbols Click on Image to Zoom Download Electronic Symbols Image : Click Here
Overview of PID Control terms
PID control can be a confusing concept to understand. Here, a brief summary of each term within PID (P. I, and D) is presented for your learning benefit. Proportional control…
Derivative (Rate) Control Theory
The final element of PID control is the “D” term, which stands for derivative. This is a calculus concept like integral, except most people consider it easier to understand. Simply…
Integral (Reset) Control Theory
Imagine a liquid-level control system for a vessel, where the position of a level-sensing float sets the position of a potentiometer, which then sets the speed of a motor-actuated control…
Proportional-only Offset
A fundamental limitation of proportional control has to do with its response to changes in setpoint and changes in process load. A “load” in a controlled process is any variable…
Proportional-only Control Theory
Imagine a liquid-level control system for a vessel, where the position of a level-sensing float directly sets the stem position of a control valve. As the liquid level rises, the…
On/off Control Theory
Once while working as an instrument technician in an aluminum foundry, a mechanic asked me what it was that I did. I began to explain my job, which was essentially…
Feedback Control Principle
Before we begin our discussion on process control, we must define a few key terms. First, we have what is known as the process: the physical system we wish to…
