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Variable Frequency Drives

Acquire skills in variable frequency drives (VFDs) in this training course. Learn techniques to control motor speeds and enhance energy efficiency in industrial systems.

City Start Date End Date fees details
Course Description
The objective of this VFD training course is to build confidence in the student by providing him/her with useful information and practical hands-on exercises
that demonstrate the relevance of the course material.
Course Objective
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 Outline
INTRODUCTION
  • Evolution of VFD Control
  • Modern Types of Variable Frequency Drives (VFD)
MECHANICAL THEORY
  • Horsepower Defined
  • Torque Defined
  • Example Horsepower and Torque Calculations
  • Common Types of Mechanical Loads
  • Characteristics of Variable Torque and Constant Torque Loads
BASIC VFD ELECTRICITY THEORY
  • Electrical/Hydraulic Circuit Analogy
  • Resistance, Voltage, and Current Defined
INTRODUCTION TO AC MOTORS
  • 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 “Across-the-Line”
  • Torque Characteristics of Motors Operated on VFDs
  • Effects VFDs on Motor Operation and Life Expectancy
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
  • 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
  • General Drive Programming
  • Methods of Speed and Torque Control
VFD Applications
  • 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
CONCLUSION AND SUMMARY