Latest Motion Control Systems Education

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Basic Feedback Control Principles

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Feedback Control System Components Before we begin our discussion on…

Non-dispersive Luft Detector Spectroscopy

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Non-dispersive analysis, while newer in discovery than dispersive…

Basics of Bridge Circuits

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A bridge circuit is basically a pair of voltage dividers where the…

High-reliability Control Systems

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As discussed at the beginning of this chapter, instrumentation safety…

Control Valve Actuators

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The purpose of a control valve actuator is to provide the motive force…

Non-contact Temperature Sensors

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Virtually any mass above absolute zero temperature emits…

Interposing Relays in PLCs

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In addition to directly performing logic functions, electromechanical…

Integral (Reset) Control

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Imagine a liquid-level control system for a vessel, where the position…

AC Motor Speed Control

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AC induction motors are based on the principle of a rotating magnetic…

VSD and VFD Motor Drive Features

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Modern DC and AC motor drives provide features useful when using…

Logic Programming in PLCs

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Although it seems each model of PLC has its own idiosyncratic standard…

Analysis of Practical Pneumatic Instruments

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To better understand the design and operation of self-balancing…

Cascade Control

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A simple control system drawn in block diagram form looks like this:…

Self-regulating, Integrating, and Runaway Process Characteristics

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Perhaps the most important rule of controller tuning is to know the…

Controller Output Current Loops

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The simplest form of 4-20 mA current loop is the type used to…

Instantaneous and Time-overcurrent (50/51) Protection

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Perhaps the most basic and necessary protective relay function is…

Diagnosing Feedback Control Problems

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Negative feedback systems, in general, tend to cause confusion for…

AC Motor Braking

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There are several different methods useful for causing an AC induction…

Digital PID Controllers

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The vast majority of PID controllers in service today are digital in…

Limit Switches

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A limit switch detects the physical motion of an object by direct…

Techniques for Analyzing Control Strategies

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Control strategies such as cascade, ratio, feedforward, and those…

Process Flow Diagrams

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To show a practical process example, let’s examine three…

Digital PID Controllers

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The vast majority of PID controllers in service today are digital in…

Control Valve Characterization

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Control valves are supposed to deliver reliable, repeatable control of…

Level Gauges (Sightglasses)

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Level gauges are perhaps the simplest indicating instrument for liquid…

The Difference Between Series and Parallel Circuits

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In addition to Ohm’s Law, we have a set of rules describing how…

Common Educational Fallacies

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When I began teaching full-time in 1998, most of what I thought I…

Memory Maps and I/O Addressing

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A wise PLC programmer once told me that the first thing any aspiring…

Interposing Relays in PLCs

Textbook

In addition to directly performing logic functions, electromechanical…

Valve Packing

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Regardless of valve type, all stem-actuated control valves require…

What is Hydrostatic Pressure?

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A vertical column of fluid generates a pressure at the bottom of the…

Teaching Technical Theory

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Learning is not merely a process of information transfer. It is first…

Principles, not Procedures

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One of the marks of a successful problem-solver is a habit of applying…

Classical Mechanics

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Classical mechanics (often called Newtonian mechanics in honor of…

Unit Conversions and Physical Constants

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Converting between disparate units of measurement is the bane of many…

An Analogy for Calibration Vs Ranging

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The concepts of calibration (trimming) and ranging are often difficult…

Non-dispersive Luft Detector Spectroscopy

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Non-dispersive analysis, while newer in discovery than dispersive…

Supervisory Control

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In a manually-controlled process, a human operator directly actuates…

Transmitter Damping Adjustments

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The vast majority of modern process transmitters (both analog and…

On/off Electric Motor Control Circuits

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An electric motor is often used as a discrete control element in a…