Inst ToolsInst ToolsInst Tools
  • Courses
  • Videos
  • Q & A
    • Interview
      • Instrumentation
      • Electronics
      • Electrical
      • Practical Questions
    • MCQ
      • Instrumentation MCQ
      • Electrical MCQ
      • Electronics MCQ
      • Control Systems MCQ
      • Analog Electronics MCQ
      • Digital Electronics MCQ
      • Power Electronics MCQ
      • Microprocessor MCQ
      • Multiple Choice Questions
  • EE
    • Electronics
      • Electronics Q & A
      • Electronic Basics
      • Electronic Devices & Circuits
      • Electronics Animation
      • Digital Electronics
    • Electrical
      • Electrical Basics
      • Electrical Q & A
      • Power Electronics
      • Electrical Machines
      • Electrical Animation
      • Power Systems
      • Switchgear & Protection
      • Transmission & Distribution
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Search
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Reading: How to Select the Right Type of Controller
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • PLC Tutorials
  • Control Systems
Search
  • Courses
  • Videos
  • Q & A
    • Interview
    • MCQ
  • EE
    • Electronics
    • Electrical
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Control Systems > How to Select the Right Type of Controller

How to Select the Right Type of Controller

Last updated: March 24, 2019 7:47 am
Editorial Staff
Control Systems
No Comments
Share
2 Min Read
SHARE

Distinguishing Characteristics

 P-only

  • Accelerates the response of controlled process
  • Produces offset except for integrating (1/s) processes

PI

  • Eliminates offset
  • Usually higher maximum deviations than P-only
  • Sluggish, long oscillating responses
  • Increased gain may lead to larger oscillations and instability

PID

  • Introduces stabilizing effect on closed-loop response
  • Exacerbates noise
  • May cause additional wear on valves, etc.

General Guidelines

  1. If possible, use P-only
  2. Use if offset acceptable for moderate values of Kc
  3. Use with integrating processes
  4. Use PI when P is unacceptable
  5. Systems that respond fast
  6. Use PID to increase the speed of closed-loop response if PI is sluggish

Examples

1. Liquid -level control

P-only

  • integrating process
  • maintain level within certain range – offset acceptable

2.Gas pressure control

P-only

  • maintain pressure within certain range – offset acceptable

3.Vapor pressure control

PI

  • direct control such as in flash tank where vapor valves is controlled to directly control vapor pressure – fast response

PID

  • indirect control such as partial condenser on distillation column – control valve adjusts cooling water to change condensation rate – response may be too sluggish with PI

4.Flow Control

PI

  • flow control is fast and direct – PI eliminates offset but D not necessary

5.Temperature control

PID

  • heating and cooling jackets involving heats of reaction and slow mass transfer rates – slow, sluggish responses will usually require D action

6.Composition control

PID

  • slow mass transfer rates usually require D action
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Certified Control Systems Technician (CCST) Questions
Identify Instruments in Piping and instrumentation Diagram
Voice Activated Industrial Automation Systems
Difference between Feedback, Feedforward, and Cascade Control?
Why Baud Rate is Important in Modbus Network?
Proportional-only Control Theory
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
208kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Proportional Controller Principle
Open Platform Communication (OPC)
Instrumentation and Control (I&C) Design
How-to do Security of SCADA Systems?
Design View of Supplying Process Control and Safety Systems
What is WHCP?
Difference between SR Flipflop and RS Flipflop ?
ICS System Design Considerations

Keep Learning

Loop Diagram

Documentation and Change Control of PLC or DCS Systems

LED Stumps in Cricket

How do LED Stumps in Cricket Work?

Boiler Drum Level Control Systems

Boiler Drum Level Control Systems

Selector Control Function in DCS

Selector Control Functions

Interposing Relay Panel (IRP)

Interposing Relay Panel (IRP) – Wiring and Testing Requirements

Difference between Analog Signal and Digital Signal

What are Analog and Digital Signals? Differences, Examples

Zener Barrier Protection

Zener Diode Barrier Principle

Instrumentation Design Details

I&C Engineer Roles & Responsibilities – Instrumentation Design

Learn More

Wattmeter Principle

Wattmeter

Thermocouple cold junction compensation

Why Thermocouple Reference Junction Compensation Required ?

Modbus ASCII and RTU Message Frame

Background of Modbus – ASCII and RTU Data Frames

Junction Box Wiring

4-20mA Junction Box versus Fieldbus (FF) Junction Box

Simulation in Machine Expert HVAC

How to do Simulation in Schneider PLC?

Simatic 300 Station Configuration

Monitor and Modify Variables in Simatic Manager

Comparison of Level Meters - Level Measurement Instruments

Comparison of Level Meters – Level Measurement Instruments

Humidity sensor Working Principle

Humidity Sensor Working Principle

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?