VFD Training

Course Duration: 2 Days

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.

Who Should Attend:
This course is recommended for electrical engineers, technicians, designers and electrical maintenance personnel responsible for variable frequency drives.

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 Outline:

I. INTRODUCTION

1. Evolution of VFD Control
2. Modern Types of Variable Frequency Drives (VFD)

II. Mechanical Theory

1. Horsepower Defined
2. Torque Defined
3. Example Horsepower and Torque Calculations
4. Common Types of Mechanical Loads
5. Characteristics of Variable Torque and Constant Torque Loads

III. Basic VFD Electricity Theory

1. Electrical/Hydraulic Circuit Analogy
2. Resistance, Voltage, and Current Defined

IV. Introduction to AC Motors

1. Examination of Motor Nameplates and NEMA Designations
2. Locked Rotor Current and Full Load Current
3. Anatomy of a Motor
4. Magnetic Poles and Frequency as Related to Motor Speed
5. Torque Characteristics Motors Operated “Across-the-Line”
6. Torque Characteristics of Motors Operated on VFDs
7. Effects VFDs on Motor Operation and Life Expectancy

V. PWM AC VFDs

1. Common Types of PWM Drives
2. Examination of the Main Power Circuit
3. Electronic Component Identification
4. The PWM Wave Form
5. Voltage and Frequency Relationships and Effects on Motor Performance
6. Control of Drive System Torque and Horsepower Output
7. Torque Output Comparisons of AC Drives VS. Conventional Means of Speed Control
8. Standing Wave (Reflective Wave) Phenomena on Motor Cables
9. Disassembly of an AC Drive
10. Component Identification
11. Various Designs of Drives
12. Reassemble, Test, Start-Up of AC Drive With Proper Techniques
13. Hands-On Programming and Operation of an AC Drive and Motor
14. Adjust Minimum and Maximum Speed
15. Reset Drive to Factory Defaults
16. Adjusting Torque Output
17. General Drive Programming
18. Methods of Speed and Torque Control

VI. VFD Applications

1. Methods of Proper Drive Selection
2. Multi-Motor Drive Systems With Example Problem
3. Using VFDs to Eliminate Geared Speed Reducers
4. Effects of AC Drives on Geared Speed Reducers
5. Replacing Mechanical Speed Changers With VFDs

VII. Conclusion and Summary

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