Learning Center

How and When to Derate Variable Frequency Drives

By Tyler Simmons on 31st Oct 2025

Sizing a variable frequency drive correctly can be complicated, but there are a few issues that can make it even more difficult. Many customers have been told in the past that they need to “derate” a drive, but don&rsq …

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What is PID Control in VFDs?

By Tyler Simmons on 15th Oct 2025

Many facilities using pumps and fans are constantly fighting the battle of maintaining just the right pressure, flow, or levels in their system. Variable frequency drives are the go-to solution for electric motor speed control bec …

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When to Use Low Voltage vs. Medium Voltage VFDs Complete Guide

By Tyler Simmons on 6th Oct 2025

Correctly sizing a variable frequency drive for a system is complicated. You consider current, application, elevation, temperature, controls, and many more factors. What makes it even more complicated is when you have a situation …

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VFD Enclosure Ratings Explained: IP vs. NEMA

By Tyler Simmons on 1st Oct 2025

Variable frequency drives, like all electrical equipment, should be kept cool, clean, and dry. We get calls every day from end users, contractors, and engineers who understand this concept but get lost in the jungle of enclosure r …

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How do You Size a Line Reactor? 

By Tyler Simmons on 26th Sep 2025

Line reactors are a common component in variable frequency drive systems. They can help to control harmonics, dV/dt, surges, and other issues. On the incoming power side of a VFD, they’re often referred to as an input or lin …

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What's New in VFDs - SmartD

By Tyler Simmons on 6th Aug 2025

Variable frequency drives have been controlling motors for over forty years, but they’ve always introduced power quality issues as a side effect. Harmonics, dV/dt, and common mode are known issues to address with every VFD. …

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