Program on Variable Frequency Drive (VFD/VVVF/AC)
(Fundamentals; Operation; Maintenance & Parameter Setting)

Training Program Objective and Description:

The objective of this program is to provide the participants with information needed to troubleshoot, diagnose, and repair problems commonly found in Electrical Drives beside thoroughly understand the concept of Electrical Drives. Practical hands-on exercises will reinforce material presented in the training sessions. This program will impart information important to proper motor selection, operation and Maintenance, Troubleshooting in detail.

Learning Outcomes:

Upon completion of this course, the participant should be able to:

  • Understand characteristics of AC/DC motors which drive control.
  • Know the components and types of variable frequency drives.
  • Understand common AC/DC drive applications and how to evaluate them.
  • Understand the advantages and benefits of using variable frequency drives.
  • Setting of various Drives Parameters & communication. (Hands on)
  • Understand how to troubleshoot AC drive applications.

Who Should Attend?

All practicing Engineers, DET,GET, O&M professionals; others who willing to get knowledge regarding VFD/AFD.

Contents to be covered:

  1. Overview ofElectrical Drives Objective of the Program.
  2. Review of Basics of Electrical Engineering.
    1. Fundamental of Voltage, Current, Power & Impedance.
    2. Resistance, Inductance & Capacitance.Behavior & Applications
  3. Concepts of AC machines: Construction, Working, Speed Control, Characteristics.
  4. Basics of various loads and Applications.
  5. Torque, Speed and Power. Review and understanding.
  6. Basics of Power Electronics.
    1. Review of semiconductor Theory; Controlled and Uncontrolled Switches: Power Diode, Power BJT, MOSFET, IGBT, SCR: ON & OFF strategies.
    2. DC Link capacitor: Selection and rating.
  7. AC to DC Rectification action.
    1. Variation with R, R-L, R-L-E load; About filter application and ripples.
    2. Applications
  8. DC to AC Inverter
    1. Inverter function: Series and parallel Inverter.
    2. Importance of L & C.
    3. 1200 & 1800 Mode of operation.
    4. PWM & SPWM control Strategy.
  9. Electrical drives(AC/DC)
    1. Basics and review of Drives: Advantages and various parts.
    2. Requirement of four quadrant operation of Drives.
    3. Open and Closed loop control strategies.
    4. Induction Motor Drive.
      1. Basics and review of three Phase Induction Motor
      2. Starting, Braking and Speed control Operation
      3. Stator voltage Control; Variable frequency control
      4. CSI Controlled AC Drives;
      5. Rotor Resistance Control; V/f control; Direct torque Control; Vector Control
      6. Flux Control methods; Smart Drives & Energy efficient drives.
      7. Soft Starting: ZCS & ZVS; Design of control Strategies: Various Comparator Circuits
      8. Concept of Load Sharing: Criteria
      9. Drive parameters: definitions and parameter setting.
  10. Installation and commissioning of Electrical Drives.
  11. Common problems in Electrical Drives and Troubleshooting
  12. Testing, Maintenance & Protection of Drives using various meters.
  13. Harmonic Elimination Techniques
  14. Communication of drives.
  15. Understanding of various drives: Product Specific as required.
  16. Case Studies & Discussion on practical problems.

Hands ON & Practical’s:

  1. Parameter Setting & Behavior of drive.
  2. Parameter Setting & Behavior of drive.
  3. Upload and Download of parameters.
  4. Copying of Drive parameters.

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