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Monthly Archives: April 2015

07
Apr 2015
4

PID with CO Filter Disturbance Rejection in the Jacketed Stirred Reactor

Signal Filters and the PID with Controller Output Filter Algorithm controlguru

The control objective for the jacketed stirred reactor process is to minimize the impact on reactor operation when the temperature of the liquid entering the cooling jacket changes. We have […]

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07
Apr 2015
8

PID with CO Filter Control of the Heat Exchanger

Signal Filters and the PID with Controller Output Filter Algorithm controlguru

The same tuning recipe we successfully demonstrated for PI control and PID controldesign and tuning can be used when a controller output (CO) filter is added to the heat exchanger […]

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07
Apr 2015
24

PID with Controller Output (CO) Filter

Signal Filters and the PID with Controller Output Filter Algorithm controlguru

The derivative action of a PID controller can cause noise in the measured process variable (PV) to be amplified and reflected as “chatter” in the controller output (CO) signal. Signal […]

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07
Apr 2015
59

Using Signal Filters In Our PID Loop

Signal Filters and the PID with Controller Output Filter Algorithm controlguru

In our study of the derivative mode of a PID controller, we explored how noise or random error in the measured process variable (PV) can degrade controller performance. As discussed […]

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07
Apr 2015
9

PID Disturbance Rejection Of The Gravity Drained Tanks

Derivative Action and PID Control controlguru

We have explored disturbance rejection in the gravity drained tanks process using P-Only and then PI control. In the PI study, we confirmed the observations we had made in the […]

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07
Apr 2015
29

Measurement Noise Degrades Derivative Action

Derivative Action and PID Control controlguru

At the start of a recent Practical Process Control workshop, I asked the attendees what the “D” in PID stood for. One fellow immediately shouted from the back of the […]

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07
Apr 2015
44

PID Control of the Heat Exchanger

Derivative Action and PID Control controlguru

In recent articles, we investigated P-Only control and then PI control of a heat exchanger. Here we explore the benefits and challenges of derivative action with a PID control study […]

35572 View
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07
Apr 2015
23

The Chaos of Commercial PID Control

Derivative Action and PID Control controlguru

The design and tuning of a three mode PID controller follows the proven recipe we have used with success for P-Only control (e.g., here and here) and PI Control (e.g., […]

31720 View
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07
Apr 2015
266

PID Control and Derivative on Measurement

Derivative Action and PID Control controlguru

Like the PI controller, the Proportional-Integral-Derivative (PID) controller computes a controller output (CO) signal for the final control element every sample time T. The PID controller is a “three mode” […]

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07
Apr 2015
142

Integral (Reset) Windup, Jacketing Logic and the Velocity PI Form

Integral Action and PI Control controlguru

A valve cannot open more than all the way. A pump cannot go slower than stopped. Yet an improperly programmed control algorithm can issue such commands. Herein lies the problem […]

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