A VFD allows motor-based systems to adjust the speed at which the motor runs. That speed is based on how much power the mechanical systems need to meet the demand of the building. The demand of the system is also referred to as the “load” of the system. By varying the speed, the motor is able to meet the needs of the load without using more energy than necessary.
Variable Frequency Drives work on the basis of taking the existing AC supply, converting it to DC using a rectifier, and then converting it back to a variable frequency supply using an inverter. Modern VFDs utilizes the new matrix design with innovative trends to optimize the performance of the VFD.
VFDs are being built into many new systems; however, they can also be added to some current systems through a retrofit. When looking to retrofit a system with a drive, consult a professional to match the drive with the existing system and motor. Making sure they are properly matched is very important in making sure you gain the highest efficiency possible
WHO SHOULD ATTEND?
The technicians and maintenance staff will be able to perform correct maintenance procedures and troubleshooting of AC motors and VFDs. This Variable Frequency Drive training course is suitable to a wide range of professionals but will greatly benefit:
Electrical Engineers
Maintenance Technicians
Electrical Supervisors
Project Engineers
Day 1 - Introduction
Applications of Power Electronics
Types of Power Electronic Circuits
Design of Power Electronics Equipment
Determining the Root-Mean-Square Values of Waveforms
Power Semiconductor Devices
Control Characteristics of Power Devices
Day 2 - Power Diodes and Rectifiers
Power Diodes and Switched RLC Circuits
Semiconductor Basics
Diode Characteristics
Reverse Recovery Characteristics
Power Diode Types 68
General-Purpose Diodes 68
Silicon Carbide Diodes 70
Silicon Carbide Schottky Diodes 71
Series-Connected Diodes
Parallel-Connected Diodes
Diode Switched RC Load
Diode Switched RL Load
Diode Switched LC Load
Diode Switched RLC Load
Freewheeling Diodes with Switched RL Load
Day 3 - Diode Rectifiers
Single-Phase Full-Wave Rectifiers
Single-Phase Full-Wave Rectifier with RL Load
Single-Phase Full-Wave Rectifier with a Highly
Inductive Load
Multiphase Star Rectifiers
Three-Phase Bridge Rectifiers
Three-Phase Bridge Rectifier with RL Load
Three-Phase Rectifier with a Highly Inductive Load
Comparisons of Diode Rectifiers
Rectifier Circuit Design
Output Voltage with LC Filter
Effects of Source and Load Inductances 148
Practical Considerations for Selecting Inductors and Capacitors
AC Film Capacitors
Ceramic Capacitors
Aluminum Electrolytic Capacitors
Solid Tantalum Capacitors
Supercapacitors
Day 4 - Power Transistors
Power MOSFETs
Steady-State Characteristics
Switching Characteristics
Silicon Carbide MOSFETs
Bipolar Junction Transistors
Steady-State Characteristics
Switching Characteristics
Switching Limits
Silicon Carbide BJTs
IGBTs
Comparisons of Transistors
Power Derating of Power Transistors
Series and Parallel Operation
BJT SPICE Model
MOSFET SPICE Model
IGBT SPICE Model
MOSFET Gate Drive
JFET Gate Drives
BJT Base Drive
Isolation of Gate and Base Drives
Pulse Transformers
Optocouplers
Day 5 - DC–AC Converters
Performance Parameters
Principle of Operation
Single-Phase Bridge Inverters
Three-Phase Inverters
180-Degree Conduction
120-Degree Conduction
Voltage Control of Single-Phase Inverters
Multiple-Pulse-Width Modulation
Sinusoidal Pulse-Width Modulation
Modified Sinusoidal Pulse-Width Modulation
Phase-Displacement Control
Voltage Control of Three-Phase Inverters
Sinusoidal PWM
60-Degree PWM
Third-Harmonic PWM
Space Vector Modulation
Comparison of PWM Techniques
Harmonic Reductions
Current-Source Inverters
Variable DC-Link Inverter
Boost Inverter
Inverter Circuit Design
Day 6 - Ac Drives
AC motors and starters
Fundamentals of three-phase AC motors
Introduction
Induction Motor Drives
Performance Characteristics
Torque–Speed Characteristics
Stator Voltage Control
Rotor Voltage Control
Frequency Control
Voltage and Frequency Control
Current Control
Constant Slip-Speed Control
Voltage, Current, and Frequency Control
Closed-Loop Control of Induction Motors
Dimensioning the Control Variables
Vector Controls
Basic Principle of Vector Control
Direct and Quadrature-Axis Transformation
Indirect Vector Control
Direct Vector Control
Day 7 - Troubleshooting variable speed drives
Power electronic rectifiers (AC/DC converters)
Gate-commutated inverters (DC/AC converters)
Overall protection and diagnostics
Installations and commissioning
Power supply connections and earthing requirements
Precautions for start/stop control of AC drives
Control wiring for VSDS
Commissioning VSDs
Day 8 - ABB drives
Direct Torque Control
basic theory
variable speed drives describes basics (VSD)
Industrial processes Application.
Bearing currents in modern AC drive systems.
Harmonic distortion, sources and effect, distortion calculation.
