Abstract: In chemical enterprises, with the increasingly refined regulation of continuous production characteristics in coal chemical industries and the demand for energy conservation and consumption reduction, the application of frequency converters has become more widespread. Among the production abnormalities caused by frequency converter failures, heat dissipation failures are particularly prominent and common. This article, after in-depth analysis of this issue, proposes the establishment of a cooling control system separate from the frequency converter, rather than solely relying on the internal cooling system of the frequency converter for temperature control and protection measures, to ensure the stable operation of the cooling part of the frequency converter.