Michael Brown Control Engineering

Fax: 086 671 9320
Email: michael.brown@mweb.co.za
www: www.controlloop.co.za
more information about Michael Brown Control Engineering

Loop Signatures 9: Digital controllers – Part 1: Introduction to the simple PID controller
October 2021, Editor's Choice

There is a commonly held belief in control circles that all PID controllers are similar and relatively simple. This is a dangerous fallacy.
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Case History 179: Some unusual measurement and control problems
September 2021, Editor's Choice

The example given in this article illustrates some mistakes made by the system integrators and control engineers at a metals extraction plant that used a well-known make of PLC and scada for its controls.
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Loop Signatures 8: Final control elements – Part 4: the infamous stick-slip cycle
August 2021, Editor's Choice

An inherent phenomenon occurring in most control valves that few people are aware of is ‘stick-slip’.
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Case History 178: An over-filtered hydrogen flow loop
July 2021, Editor's Choice

A good example that shows how lack of knowledge of the practicalities of control can result in terrible control characteristics.
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Loop Signatures 1: Introduction to the Loop Problem Signatures series
May 2020, 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 ...
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Loop Signatures 7: Final control elements – Part 3 hysteresis and deadband
June 2021, Editor's Choice

Some of the biggest problems associated with the final control element are hysteresis and backlash.
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Case History 177 - Valves, valves, valves!
May 2021, Editor's Choice

75-85% of all industrial control loop problems are caused by valve issues.
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Loop Signatures 6: Final control elements – Part 2: characteristics.
April 2021, 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.
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New online control loop optimisation and tuning service
April 2021, News

Michael Brown has introduced an online control loop optimisation and tuning consultation service designed to help plant engineers all over the world understand why their loops are not behaving the way ...
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Control Loop: Case History 176 The importance of programming PLC control modules correctly.
March 2021, 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.
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Control Loop: Loop Signatures 5
February 2021, 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.
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Control loop: Case History 175 Oversized valve disrupts good control
January 2021, 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.
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