VFD - Variable Frequency Drives
Course details
VFD - Variable Frequency Drives
Variable frequency drives (VFD) are widely used in industry for better process control as well as energy optimization. This course brings to you a detailed know-how about basic concepts, applications, selection, configuration, operations, and maintenance of VFD.
Modules : 12
Durations : 30-40 minute each module.
Program Details
| Session Name | Description |
|---|---|
| Speed Control of Motors – Basic Concepts | Basic Concepts (Force, Angular velocity, Linear velocity, Torque), DC motor (concept, advantages, disadvantages), AC motor (concept, advantages, disadvantages), Simpler control methods, Controlling DC Motors |
| Application of VFD | Why VFD, benefits, applications, Use of VFD and energy efficiency of the system, three classes of operation |
| Motor Drives - Basics | Controlling speed, controlling torque & speed, efficiency of the system, Variable Speed Drives, Varying frequency and voltage, Different modes of operation of a drive, Dynamic response of an adjustable speed electric motor drive system, DC Drives, Servo drives, The difference between VFD and servo drive |
| Structure of VFD | VFD Technology, The topology of VFD, Power electronic devices - Thyristor or SCR – Silicon Controlled Rectifier, GTOs – Gate turn off thyristors, Fast switching transistors, IGBTs – Insulated gate bipolar transistors, Rectifier, Inverter, PID, PID control strategies |
| Advanced VFD topologies | VVVF -Variable Voltage Variable Frequency control, Voltage boosting, Constant Volts per Hertz Operation, Operating Regions, Vector Drive, AFR - Active Front end rectifier Topologies. |
| VFD Selection | VFD Specifications, User Parameters, Motor Selection, Cable Selection, Energy saving using VFDs in centrifugal machines, Steps to estimate saving, Special Features of VFD, VFD Selection, Drive specifications |
| Advanced VFD configurations | Use of Common Rectifier, Multiple drive systems, N+S Configuration/ Hot Standby Configuration / Dual Tandem Configuration, Redundant VFD, VFD with DOL backup or Bypass, how to bypass a VFD, LCI inverters - Load Commutated Inverters, Dynamic braking, Regenerative Drives, Medium Voltage MV drives |
| Operating motors using VFD | Start, stop, flying start, skip frequency, dynamic breaking, regenerative breaking etc. Field applications of programmable parameters. |
| VFD as part of a larger system | Safety concerns, Harmonics and mitigation, large capacity MV drives, vector drives and servo drives. |
| Installation and maintenance | Installation, maintenance, commissioning and safety concerns |
| Testing of VFD | FAT and SAT testing procedures |
| Special topics | Input considerations, protection considerations, output considerations (reflected wave phenomenon), EMI / RFI, harmonics, redundancy considerations |
Special offer for students and groups