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CENGAGE Learning
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076681923X
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Electrician's Technical Reference, Variable Frequency Drives
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076681923X
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Electrician's Technical Reference, Variable Frequency Drives
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Detailed Description
Electrician's Technical Reference, Variable Frequency Drives
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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