Variable Frequency Drive - University of Hawaii

Variable Frequency Drive Donald Kaulukukui What is a VFD? Variable Frequency Drive (VFD) A VFD can be used to control both the speed and torque of a standard induction AC electric motor. It varies both the frequency and amps of the AC

waveform being delivered to the motor saving money in electricity. Basic components of a VFD: Input section, draws AC electric power from the utility, Rectifier section, converts the AC into DC power. Inverter section, converts DC back into a controllable AC waveform. Purpose of the VFD VFDs help to limit demand and electrical

consumption of motors by reducing the amount of energy they consume. Standard motors are constant speed and when they are energized they run at a 100% no matter the load. Soft Start Only use energy you need Ohana Malia - Booster Pump Amps 20.00 New Booster Pumping System Installed

16.00 14.00 12.00 10.00 8.00 6.00 4.00 Time 5 :00 PM 5 :00 PM 5 :00 PM

5 :00 PM 5 :00 PM 5 :00 PM 0.00 5 :00 PM 2.00 5 :00 PM B ooster Pump A mps

18.00 Potential Problems Improper Circuit Design Harmonic Distortion Safety 3 phase generation Microcontroller programming Expectations Learn pulse width modulation techniques Learn application of microcontroller features

Learn advanced circuit design Learn AC motor theory Learn energy conservation methods Goals Single phase 120V 60 Hz AC generation Three phase 220V 60 Hz AC generation

Three phase 220V Variable Frequency AC generation Temperature controlled VFD VFD Start Done Circuit Design

Duration Programming AC - DC converter DC - DC converter DC - AC inverter 8/26/2007 9/15/2007 10/5/2007 10/25/2007 11/14/2007 12/4/2007 12/24/2007 1/13/2008 2/2/2008

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