Abstract : This paper addresses several issues and offers suggestions for improvement in the practical application of frequency converters, focusing on aspects such as application environment, electromagnetic compatibility, power grid quality, and motor insulation. Keywords : Frequency converter; Environmental electromagnetic compatibility; Compatibility 1 Introduction With the booming market for general-purpose frequency converters, excluding OEM imported frequency converters, the annual consumption of general-purpose frequency converters in China exceeds 2.5 billion RMB. This has led to a surge in the workload of installing, commissioning, maintaining, and repairing frequency converters and their auxiliary equipment, causing significant direct and indirect losses to users. Based on the actual application experiences of numerous users, this paper analyzes the causes of these problems from the perspectives of application environment, electromagnetic interference and anti-interference, power grid quality, and motor insulation, and proposes some improvement suggestions. 2 Working Environment Issues In practical applications of frequency converters, most domestic customers, except for a few with dedicated machine rooms, install frequency converters directly in industrial sites to reduce costs. These sites are generally characterized by high dust levels, high temperatures, and, in southern regions, high humidity. The cable industry also faces metal dust, while the ceramics and printing and dyeing industries encounter corrosive gases and dust. In coal mines and other similar environments, explosion-proof requirements exist, among others. Therefore, corresponding countermeasures must be taken according to the site conditions. 2.1 Basic requirements for the installation design of frequency converters (1) The frequency converter should be installed inside the control cabinet. (2) The frequency converter is best installed in the middle of the control cabinet; the frequency converter should be installed vertically, and large components that may block the exhaust and intake should be avoided directly above and below it. [b][align=center]For details, please click: Several issues that need attention in the engineering application of frequency converters[/align][/b]