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MC-100: AC & DC Variable Speed Motor Drives

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This 32-hour, 4 day training program is designed to provide maintenance electricians with a thorough understanding of AC and DC motor construction, operation and variable speed control. Hands-on lab exercises are used throughout the training program to simulate actual plant conditions. Course hardware will include Variable Frequency AC and DC Motor Drive Workstations, Circuit Test Workstations, Oscilloscopes and Multimeter test equipment. Hands-on labs will explain operation and troubleshooting of diodes, transformers, SCR’s, transistors and other electrical control devices.


  • Electrical Review: Voltage, Current, Power,  Resistance, Magnetism, Reactance
  • Motor Fundamentals: Motor Construction and Operation
  • Variable Speed Drives
  • Power Module (Converter): Transformer, Rectifiers, SCR’s, Bridge Rectifier
  • Soft Start
  • DC Motor Speed Control: Field and Armature Voltage/Current Control
  • Braking
  • AC Motor Speed Control: Reading, Setting and Adjusting Parameters & Converters, Inverters
  • Six-step, PWM, Vector
  • Transistors, GTO, IGBT, Darlington
  • Control Circuits
  • Troubleshooting


This course is designed for plant maintenance personnel and other technicians who need to broaden their understanding of fundamentals of AC & DC motor troubleshooting and operation. MC-100 answers the prerequisite requirements of our Drives courses.


A basic understanding of electrical principles of voltage, power, current and resistance.


32 Hours / 4 days




Persons successfully completing this course will be able to:

  • Explain basic AC and DC motor operation.
  • Identify motor parts and function.
  • Describe variable speed motor control.
  • Explain main drive units operation and function.
  • Understand basic theory of SCR’s, diodes, transistors, triacs, and other electrical control devices.
  • Troubleshoot circuits using a multimeter and an oscilloscope.
  • Use prints to isolate drive and motor problems.
  • Read and Set Drive Parameters.

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