Variable Speed Drives

The continuous advancement of power electronics technology provides significant opportunities for the industry to operate all process control equipment and associated motors with better efficiency and higher reliability than ever before. Variable speed motor drives are widely used in the industry to continually adjust the speed and torque of motors to achieve the required control for automation with the most efficient approach possible

Audience

The seminar is designed for electrical/electronic engineers and technicians, maintenance personnel, plant technical staff, and supervisors who have some basic knowledge of electrical engineering and wish to expand their knowledge and learn the state-of-the-art in variable speed motor drive technology and the issues associated with it.

Course objectives

This course is designed to enable participants to:

Properly Matching A Drive to A Machine
Choosing the Correct Motor
Choosing the Best Type of Variable Frequency Drive (VFD)
Identify & Correct Drive System Problems
Identify & Test Major Drive Components
Perform Start-Up of an AC Drive
Program & Adjust the Drive for Desired Operation

Course contents

Day-1

Evolution of VFD Control
Modern Types of Variable Frequency Drives (VFD)
Horsepower Defined
Torque Defined
Example Horsepower and Torque Calculations
Common Types of Mechanical Loads
Characteristics of Variable Torque and Constant Torque Loads

Day-2

Basic VFD electricity theory

Electrical/Hydraulic Circuit Analogy

Resistance, Voltage, and Current Defined

Examination of Motor Nameplates and NEMA Designations

Locked Rotor Current and Full Load Current

Anatomy of a Motor

Magnetic Poles and Frequency as Related to Motor Speed

Torque Characteristics Motors Operated â€œAcross-the-Lineâ€

Torque Characteristics of Motors Operated on VFDs

Effects VFDs on Motor Operation and Life Expectancy

Day-3

PWM AC VFDs

Common Types of PWM Drives
Examination of the Main Power Circuit
Electronic Component Identification
The PWM Wave Form
Voltage and Frequency Relationships and Effects on Motor Performance
Control of Drive System Torque and Horsepower Output
Torque Output Comparisons of AC Drives VS. Conventional Means of Speed Control
Standing Wave (Reflective Wave) Phenomena on Motor Cables
Disassembly of an AC Drive
Component Identification
Various Designs of Drives

Day-4

Reassemble, Test, Start-Up of AC Drive With Proper Techniques
Hands-On Programming and Operation of an AC Drive and Motor
Adjust Minimum and Maximum Speed
Reset Drive to Factory Defaults
Adjusting Torque Output

Day-5

General Drive Programming
Methods of Speed and Torque Control
Methods of Proper Drive Selection

Multi-Motor Drive Systems With Example Problem
Using VFDs to Eliminate Geared Speed Reducers
Effects of AC Drives on Geared Speed Reducers
Replacing Mechanical Speed Changers With VFDs

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