AC versus DC drive For decades DC drive was a preferred choice for variable speed motors due to its easy and accurate way of speed or torque control. However, the development of AC drives changed the competitive landscape and paved Read more
Merry Christmas We would like to wish all our customers, partners, supporters and friends a Merry Christmas. Thank you for joining us on our journey through 2020. As the world is getting faster and faster, we hope that you can Read more
VFD safety functions In this article you will read about VFD safety functions, their importance and principles. Safety is on top of the agenda for most companies, at least in all developed countries. One top manager calls safety one of Read more
VFD as soft starter Welcome to the next article in our motor starting series. This time we will talk about VFD as a soft starter. Our first post focused on direct on-line motor start as the cheapest and simplest method. Read more
Part 2: Overview of motor starting methods Electric motors as work horses of the industry are extensively used since decades. The topic of motor starting is therefore well known and various starting methods had been developed. This article presents an Read more
Part 1: Direct on-line start This series talks about solutions to start larger medium voltage motors. Aspects such as effectiveness, cost, impact on the supplying grid and driven load or effects on the motor design are taken into account. Article Read more
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VFD control: An introduction In this post we introduce basic thoughts on VFD control. Some of you asked deeper questions about different motor control strategies and their benchmark. Such comparison will be subject of a separate post, resp. a dedicated Read more
Selection of a variable frequency drive In this post we walk through some aspects regarding selection of a variable frequency drive. Variable frequency drives, often abbreviated as VFD, VSD or ASD, are means to achieve energy savings [1] and to Read more
Undervoltage Ride Through This post talks about VFD capability to withstand a fault in the supplying grid without tripping the drive system – undervoltage ride through function [1]. Availability of drive system is very important for many users and the Read more