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
Current, voltage and power scaling of VFD Variable frequency drives (VFD) became unthinkable part of industrial motor drives. They cover voltages from some 120 V up to 13.8 kV (special designs go even higher) and power range from fraction of Read more
Advantages of liquid cooled drives This article deals with liquid cooling for high power variable frequency drives (VFD). What is the principle of liquid cooling? What kind of liquid can be used for cooling? What are the advantages of liquid Read more
VFD testing: Introduction Abstract This new series on VFD testing will guide you through various aspects of testing of variable frequency drives (VFD) and drive systems. We will discuss tests required by standards (particularly IEC), factory acceptance tests, site acceptance Read more