VFD - Variable frequency drive

A modern VFD is a compact, well-developed unit which is relatively easy to install. The cost of a VFD has decreased over the years while the performance has improved.

VFDs are usually installed to allow for better process control. The use of VFD is unfortunately not so straight forward. There are numerous technical aspects to take into account when designing a VFD controlled pumping system.
See technical aspects.

VFD is used in many sewage pumping applications with the intention of saving energy. Not every pump application will benefit from VFD control. The only way to determine if VFD is the correct choice is to do a thorough analysis. The system characteristics determine if VFD control is economically motivated or not.
See economical aspects.

Basic Principle

Economical Aspects

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Technical Aspects