SA Instrumentation & Control - Control Loop

Control Loop

Loop Signatures 1: Introduction to the Loop Problem Signatures series
May 2020, Michael Brown Control Engineering, Editor's Choice
Over the years I have had many requests to write a book giving more detailed explanations of some of the problems I have encountered in my work on practical loop optimisation. I am by nature and inclination ...

Read more...
Loop Signatures 7: Final control elements – Part 3 hysteresis and deadband
June 2021, Michael Brown Control Engineering, Editor's Choice
Some of the biggest problems associated with the final control element are hysteresis and backlash.

Read more...
Case History 177 - Valves, valves, valves!
May 2021, Michael Brown Control Engineering, Editor's Choice
75-85% of all industrial control loop problems are caused by valve issues.

Read more...
Loop Signatures 6: Final control elements – Part 2: characteristics.
April 2021, Michael Brown Control Engineering, Editor's Choice
Feedback theory generally assumes that the process has a linear transfer function, which means that equal changes on the input will result in equal changes on the output.

Read more...
Control Loop: Case History 176 The importance of programming PLC control modules correctly.
March 2021, Michael Brown Control Engineering, Editor's Choice
Every time I work on a plant that is using a PLC and scada system for feedback control, I always first do a test on a controller module to ensure that the controllers have been configured correctly.

Read more...
Control Loop: Loop Signatures 5
February 2021, Michael Brown Control Engineering, Editor's Choice
This article outlines some of the practical problems and rules of thumb relating to final control elements, which can affect control in the real world.

Read more...
Control loop: Case History 175 Oversized valve disrupts good control
January 2021, Michael Brown Control Engineering, Editor's Choice
This article provides good insight into the dangers of using largely oversized valves, and into the importance of understanding practical control, and how your controllers work.

Read more...
Loop Signatures 4: Process dynamics – deadtime and simple lags
November 2020, Michael Brown Control Engineering, Editor's Choice
Two important dynamic factors occurring in the majority of process responses are deadtime, and the first order lag.

Read more...
Case History 174: The importance of setting up your controller properly
October 2020, Michael Brown Control Engineering, Editor's Choice
It always amazes me that so few people really understand the workings of their feedback controllers. I have met only a few who really understand the practicalities of control blocks.

Read more...
Loop Signatures 3: Process Dynamics – process gain
September 2020, Leaderware, Editor's Choice
If one wishes to control a process, then it is important to have a reasonable understanding of the process itself and certainly one should also be aware of the external influences that can act on it.

Read more...
Loop Signatures 2: The two classes of processes.
July 2020, Michael Brown Control Engineering, Editor's Choice
This article will discuss the two classes of processes called self-regulating and integrating (or ramping) processes. This subject is absolutely vital to regulatory control, but strangely is seldom taught ...

Read more...
Case History 172: Interesting controls in a copper extraction plant.
June 2020, Michael Brown Control Engineering, Editor's Choice
In my 30 years devoted to optimising controls in industrial process plants in many countries, I thought that I had seen all the possible process dynamics that one would encounter. Imagine my surprise ...

Read more...
Case History 171: Instability in a metallurgical plant
March 2020, Michael Brown Control Engineering, Editor's Choice
I have written several articles about the unique problems I have encountered, specifically in the mining processing industry. This article is about some experiences in a mining operation where recently ...

Read more...
Case History 169: Tuning a very difficult temperature control loop
November 2019, Editor's Choice
As I have mentioned in previous articles, Greg McMillan, one of the world’s top control experts, has said that he finds temperature control loops generally the worst optimised processes as most people ...

Read more...
      Page 1 of 8   Next >   Last >>