This series about various aspects of variable frequency drive (VFD) dimensioning
VFD catalog rating You have surely noticed that most manufacturers have catalogs and brochures with tables listing their VFD types along with basic information such as rated output current, motor shaft power, cooling requirements, enclosure type, dimensions, weight etc. What is behind this VFD catalog rating and how to understand Read more…
Long motor cables Today we gonna talk about long motor cables and their impact on drive systems. In some projects the physical distance between VFD and motor as well as cable routing cause motor cables to be fairly long. This fact has impact on system design. The motor control might Read more…
High altitude Majority of variable frequency drive (VFD) systems is installed at altitudes below 1’000 meters above sea level (masl). In such cases no additional considerations due to installation height apply. However, there are sites located at high altitudes. How does it impact the VFD and other drive components? What Read more…
Derating and uprating factors What is the power rating of the specific VFD? An indicative value is provided in the technical catalog or brochure. This value shall refer to certain operation conditions, among others the temperature of cooling medium (air or liquid), content of anti-freeze additive (usually some type of Read more…