Electrician's Technical Reference : Variable Frequency Drives

by: Robert Carrow

Topics include: flux vector drive, torque regulation, inverter duty, over voltage spikes, volts per hertz, shaft voltages, drive enclosure, variable pitch pulley, auxiliary blower, inverter section, electric noise, slip compensation, voltage boost, nonlinear loads, vector drives, variable torque, drive supplier, speed regulation, torque applications, electronic drive, drive equipment, acceleration torque, affinity laws, motor slip, motor nameplate

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First Sentence:
"If some machine or process is moving, if air is being blown, or if water is being pumped, then there is motion."

Book Description
The variable frequency drive industry is growing rapidly, and it is now more important than ever for technicians and maintenance personnel to keep VFD installations running smoothly! Part of the Electrician's Technical Reference Series, this field guide is ideal for gaining access to information about variable frequency drives, including how they work, how to apply them, and how to troubleshoot them. A hands-on reference, Variable Frequency Drives contains sufficient information for a technician to troubleshoot any AC variable frequency drive, virtually eliminating the need for manufacturer-specific manuals! Both industrial and commercial variable frequency drive applications are addressed, with discussion of installation issues, troubleshooting, metering, sizing and selection, energy savings with variable frequency drives, and more. A final chapter preps readers for future developments in variable frequency drive technology, while appendices feature addresses of relevant organizations and a bibliography of suggested readings.

Features:

* Troubleshooting trees are included to guide technicians logically through the steps required for successful variable frequency drive repairs

* Speed, torque and horsepower formulas and tables present basic concepts of electricity and power transmission as they relate to VFDs.

* Examples of how to draw conclusions from minimal field and motor data are provided.

* Straightforward discussion aimed at addressing the maintenance of VFDs, harmonic distortion, premature failures, and long cable lengths is featured.

* Durable hardcover makes it easy to take Variable Frequency Drives into the field.

Table of Contents:
Dedication
Introduction
Chapter 1- Variable Speed Drive Types: Speed Control, Pressure, Temperature, and Flow Control, Process Control and Automation, Traditional Variable Speed Systems, Solid State Variable Speed Controllers
Chapter 2- Electrical and Power transmission Basics: Electricity and Power Transmission, Speed, Torque, Horsepower, Power Factor, Capacitors, Inductors, Semiconductors, Frequency Bands
Chapter 3- AC Induction motor and Variable Frequency Drive Basics: AC Induction Motor Theory, AC Motor Construction, Inverter Duty Motor - NEMA MG-31, Using Nameplate and Motor Data, VFD Theory of Operation, Pulse Width Modulation, Volts Per Hertz, VFD Types: Variable Voltage (VVI), Voltage Source (VSI), Current Source (CSI), Flux Vector, Sensorless Vector, Direct Torque Control, Field Oriented Control
Chapter 4- Installation Issues Concerning Variable Frequency Drives: Control and power Wiring Methods, Harmonic Distortion/Power Quality, Overvoltage Reflection, Shaft Voltage's and Bearing Currents, Carrier Frequency, EMI and RFI, Heat Dissipation and Enclosures
Chapter 5- Troubleshooting of Variable Frequency Drives: Proper Setup, Fault Handling, Diagnostics, troubleshooting Trees, Maintenance
Chapter 6- Metering of VFD's: Input Waveforms, Harmonic Analysis, DC Bus, Output Voltage, Output Waveform, Power Module Testing
Chapter 7- Sizing and Selection of VFD's: Ambient Conditions, Constant vs
Variable Torque, High Starting Torque, Multiple Motors, Closed Loop and High Performance
Chapter 8- Industrial and Commercial VFD Applications: HVAC Systems: Return and Supply Fans, Boilers, Chiller Pumps, Setpoint (PID) Control
Process Control, Automated Systems, Machines
Chapter 9- Energy Savings with Variable Frequency Drives: Efficiency, Affinity Laws, EPACT, Fan and Pump Curves
Chapter 10- Future Variable Frequency Drives: Faster Switching Transistors, 12 and 24 Pulse systems, New Technologies, Applications
Appendices: Useful Formulas, Organization Addresses, Applications
Bibliography and Suggested Further Reading
Index

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