SA Instrumentation & Control - Control Loop

Control Loop

Do mines have particularly bad control problems?
April 2001, Michael Brown Control Engineering, System Integration & Control Systems Design
In the far distant past when I first started my own business we specialised in automating plants mainly on gold and platinum mines. Even inexperienced as I was in those days, I soon realised that the ...

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Introduction to 'loop problem signatures' series
September 2000, Michael Brown Control Engineering, System Integration & Control Systems Design
In response to the frequent requests for more detailed information on control loop problem solving, I intend publishing some of the information dealt with in our courses in the next series of articles. ...

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Solving problems in a gas mixing system
July 2000, System Integration & Control Systems Design
During a recent control course presented in a South African continuous process plant, part of the practical work was spent in optimising a hydrogen/nitrogen gas mixing system A schematic of the mixing ...

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Control: perceptions versus reality
May 2000, System Integration & Control Systems Design
When starting in-plant control courses I always ask the class members to give me their individual estimates as to how many of their loops they believe to be operating satisfactorily in automatic. In a ...

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Unusual control loops in a chemical plant
April 2000, System Integration & Control Systems Design
During in-plant courses on practical process control the most interesting part of the course is always the last few days which are spent optimising live loops in the actual plant. Even with a powerful ...

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Another valve with weird characteristics
March 2000, System Integration & Control Systems Design
Figure 1 is the open loop test on the flow loop. It should be noted that as the valve appeared extremely linear with a nice fast response and was hysteresis free, the test was only conducted over a flow ...

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Faulty positioner causes instability
Jan 2000, System Integration & Control Systems Design
         In a recent course held in a South African chemical plant, a loop was encountered that cycled continuously. The loop was a pressure control that was acting as the slave (secondary) loop in ...

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