Tag Archive: feedback

Sep
02

Boot Camp for New Employees

bootcamp

In 2012 Emerson Process Management established a boot camp for new employees. In the boot camp I teach the classes on process control. The presentation I use in boot camp is based on material and process examples from our book Control Loop Foundation – Batch and Continuous Processes. The students in the boot camp use …

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Nov
07

Interfacing to Motorized Actuator

Interfacing to Motorized Actuators

At Emerson Exchange, 2011, I had the pleasure of working with Tom Pesek, Marketing Manager, Emerson Process Management to host a workshop on Interfacing the DeltaV control system to motorized actuators. The workshop addresses the use of motorize actuators for valves and dampers. These types of actuators may be preferred for some process control applications. …

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Oct
31

ISA Best Seller Award – Control Loop Foundation

ISA Best Seller

In early September, Mark Nixon and I were notified by ISA that we were recipients of the “Raymond D. Molloy Award” presented by the ISA Publications Department. Our book, Control Loop Foundation—Batch and Continuous Processes, sold the most units of any new book published by ISA in 2010. We received this award in the Mardi …

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Sep
26

Commissioning Control Systems – Setting Controller Action

Setting Controller Action

The process gain may be negative or positive depending on the process design. To provide the correct response a feedback control block must take into account the process gain direction—whether to increase or decrease the manipulated input to correct for a control error. For example, the inlet flow to a tank may be manipulated to …

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Jan
31

Cascade Control

Cascade control may be applied when a process is composed of two or more (sub)processes in series. To apply cascade control, the output of each of these processes must be measured. The input to the first process is directly manipulated. Since the output of each process in the series is the primary input of the …

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Jan
24

Feedforward Control

One of the fundamental limitations of single-loop control is the fact that all control action is based on the error between the setpoint and the controlled parameter. If there is no error, then the control output will remain at its last value. To correct for process disturbance input using single-loop control, the disturbance input must …

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Jan
10

PID Feedback Control

Many processes have measured and unmeasured disturbance inputs that can significantly impact the value of the controlled and constraint outputs. Process plants are often quite complex and it is not possible for the operating staff to safely and efficiently control the process manually during normal operation. The most common means of providing automatic feedback control …

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Nov
22

Control Loop Foundation Class

The book Control Loop Foundation originated from an internal Emerson training class that I put together for new engineers. The Education Services training center located in Austin, TX provided a class room for this training class. I found this to be an ideal training environment for teaching the class since each class room in the …

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Nov
15

Control Loop Foundation Web Site

This week we completed work on the web site for the book Control Loop Foundation. Anyone can access this web site to view and perform the exercises for workshops and applications define in the book – a total of 19 exercises. Since the web site is constructed using HTML5, it may be accessed using a …

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Nov
11

Control Loop Foundation Overview

In a previous blog posting I provided some information about the book Control Loop Foundation co-authored by me and Mark Nixon This ISA publication became available for sale a week before Emerson Exchange 2010. To help promote the book, Mark and I put together an overview of Control Loop Foundation that we presented as a …

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