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Sizing a VFD-2PM CST August 2, 2018


Variable Frequency Drives (VFDs) have been and continue to be used in many applications within our water and wastewater treatment plants. Applied correctly and the simple VFD will extend the life of your aging infrastructure and even reduce energy cost. Properly selecting a VFD may not be fully understood and this presentation will help demystify VFDs, providing a better understanding as to where and why you would use them. Attendees will cover:

• The “Don’ts” such as don’t size the drive on Hp alone and Don’t forget the system voltage

• The “Remember To things like” – location, altitude, enclosures

• Uh – OH’s like long motor leads and non-invertor motors

• Maybe a little single phase talking or off the power point topics like harmonics

• And certainly, during the course we will cover some problem areas and even troubleshooting

About the Presenter

Larry Stanley was raised and educated in the coal fields of rural West Virginia, earning a BSEET degree from Bluefield State College in West Virginia. He has more than 30 years of experience working with all aspects of design, application, and installation of AC drives and soft-starts. Stanley developed and maintained the drive support group for a major manufacturer from 1985 to 1997. He moved into a Senior Field Engineer’s role in 1997, and since then, supports applications including commercial, municipal, hot ladle, distribution conveyance, food and beverage, and more.

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Mass Rural Water Association

781 Millers Falls Road, Northfield, MA 01360

Phone: 413-498-5779

Fax: 413-498-9943