Variable Speed (AC) Drives

About This Course

This course delivers the foundational knowledge a mechatronics technician needs to work with variable speed drives (VSDs), also called variable frequency drives (VFDs) or AC drives. It begins with the working principles of a drive — how a rectifier, DC bus and IGBT inverter use pulse-width modulation to vary the voltage and frequency fed to an AC motor — together with the mechanical and electrical fundamentals (torque, power, AC/DC, voltage and current) and the Human Machine Interface (HMI) used to access drive data.

Building on this, trainees learn to read motor nameplates to IEC/NEMA definitions, select and match a drive to a motor and load, describe the drive’s internal components and I/O, perform a safe start-up, program a drive from the HMI (ramps, V/f, braking), and finally test, troubleshoot and maintain a complete drive system. Practical workshops mirror real industrial commissioning so that, in one intensive week, students reach foundational competency in AC drives suitable for Nigeria’s manufacturing, oil/gas and process sectors, working to IEC 61800 and IEEE 519 standards.

Explain the working principles and main components of a variable speed (AC) drive.
Apply mechanical and electrical fundamentals (torque, power, AC/DC, voltage, current) to drive systems.
Read motor nameplates to IEC/NEMA definitions and match a drive and motor to an application.
Select an appropriately sized VSD for variable-torque and constant-torque loads.
Describe converter, DC bus and inverter stages and wire a drive's digital and analog I/O.
Perform a safe installation and basic start-up of an AC drive.
Program a drive from the HMI, setting V/f, acceleration/deceleration ramps and braking.
Test major drive functions, diagnose faults and carry out preventive maintenance per IEC 61800 and IEEE 519.

Course Content

Module 1

Introduction to Variable Speed Drives

Understand what a variable speed drive does. This module explains VSD working principles, the mechanical fundamentals of torque and power, the electrical fundamentals of AC/DC, voltage and current, and the Human-Machine Interface used to access drive data.

What's included