Bypass in VFD applications Have you also come across that question: ‘What is actually meant with VFD bypass?’ This article presents 3 different meanings of bypass in VFD applications. Confusion about meaning of bypass I have noticed a common misunderstanding when talking about bypass in VFD applications that inspired me Read more…
Tram CKD Tatra KT8D5 In this post we introduce a legendary tram KT8D5 made by famous Czechoslovak company CKD (Ceskomoravska Kolben-Danek). The tram CKD KT8D5 is a work horse that provides efficient and reliable public transport in many cities in Central and Eastern Europe. History of Tatra KT8D5 CKD Tatra Read more…
Braking capability of VFD fed motors Not every VFD is capable of active braking. And not every application requires active braking either. In today’s post we are going to review the braking capability of most common medium voltage VFDs. Let’s start with the need for braking. In fact, many applications Read more…
What does purely inductive network actually mean? When calculating network harmonic distortion of variable frequency drives (VFD) there are basically two ways differentiating in complexity and eventually also accuracy. One is a simple harmonic calculation while the other option is a network harmonic study. The harmonic calculation is based on Read more…
How to diagnose bearing issues Bearings are key mechanical components of rotating machines and motors are obviously no exception. Bearing failures make a considerable portion of overall motor failures. In this post we look at factors influencing bearing lifetime, explore the failure modes and provide some hints how to assess Read more…
VFD Industry Requirements: Mining and Minerals In this post we will explore VFDs working in the mining and minerals market segment. What are the services, drive requirements and technical challenges? Let’s have a brief look. Drives in the mining industry VFDs in mining industry are used to crush the ore, Read more…
What makes electric drives superior? We are very passionate about VFDs and electric drives in general. They have some unique features that make them outstanding compared to other types of drivers. What are some of these properties? This post lists 8 reasons that make electric drives superior to their traditional Read more…