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Monthly Archives: April 2015

07
Apr 2015
17

PI Disturbance Rejection in the Jacketed Stirred Reactor

Integral Action and PI Control controlguru

The control objective for the jacketed reactor is to minimize the impact on reactor operation when the temperature of the liquid entering the cooling jacket changes (detailed discussion here). As […]

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07
Apr 2015
30

The Challenge of Interacting Tuning Parameters

Integral Action and PI Control controlguru

Many process control practitioners tune by “intuition,” fiddling their way to final tuning by a combination of experience and trial-and-error. Some are quite good at approaching process control as art. […]

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07
Apr 2015
18

PI Disturbance Rejection Of The Gravity Drained Tanks

Integral Action and PI Control controlguru

When exploring the capabilities of the P-Only controller in rejecting disturbances for thegravity drained tanks process, we confirmed the observations we had made during the the P-Only set point tracking study […]

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07
Apr 2015
75

PI Control of the Heat Exchanger

Integral Action and PI Control controlguru

We investigated P-Only control of the heat exchanger process and learned that while P-Only is an algorithm that is easy to tune and maintain, it has a severe limitation. Specifically, […]

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07
Apr 2015
882

Integral Action and PI Control

Integral Action and PI Control controlguru

Like the P-Only controller, the Proportional-Integral (PI) algorithm computes and transmits a controller output (CO) signal every sample time, T, to the final control element (e.g., valve, variable speed pump). […]

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07
Apr 2015
14

Controller Gain Is Dimensionless in Commercial Systems

Caution: Pay Attention to Units and Scaling controlguru

In modern plants, process variable (PV) measurement signals are typically scaled to engineering units before they are displayed on the control room HMI computer screen or archived for storage by a […]

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07
Apr 2015
17

P-Only Disturbance Rejection Of The Gravity Drained Tanks

Proportional Control - The Simplest PID Controller controlguru

In a previous article, we looked at the structure of the P-Only algorithm and we considered some design issues associated with implementation. We also studied the set point tracking (or […]

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07
Apr 2015
38

P-Only Control of the Heat Exchanger Shows Offset

Proportional Control - The Simplest PID Controller controlguru

We have discussed the general proportional only (P-Only) algorithm structure and considered important design and tuning issues associated with implementation. Here we investigate the capabilities of the P-Only controller on […]

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07
Apr 2015
203

The P-Only Control Algorithm

Proportional Control - The Simplest PID Controller controlguru

The simplest algorithm in the PID family is a proportional or P-Only controller. Like all automatic controllers, it repeats a measurement-computation-action procedure at every loop sample time, T, following the […]

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07
Apr 2015
46

The Normal or Standard PID Algorithm

Process Control Preliminaries controlguru

The question arises quite often, “What is the normal or standard form of the PID (proportional-integral-derivative) algorithm?” The answer is both simple and complex. Before we explore the answer, consider […]

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