Low-voltage asynchronous-motor frequency converters' technical functions

Abstract

The electric drive is part and parcel of the industry. It is used to control the speed of an electric motor, to adjust the energy consumption to match just the demand. The frequency converter is a modern tool to improve the energy efficiency of different industrial equipment, ventilation systems, pump stations, vessels, transportation etc. Nowadays, drives manufacturers offer a wide range of various technical features. On one hand, it becomes simpler to match functional requirements, but on the other hand an engineer has to know how to choose suitable technical functions for a certain application. This work contains an overview of all diagnostic and technical features of frequency converters of various manufacturers available on Russian market and a statistical analysis of these functions for a better understanding the diversity between different brands. Besides, the experimental analysis was made to show an example of several programmable features one of the converters. The paper has the practical value for engineers designing, installing, operating or maintaining electrical drives.