Abstract: The article aims at request of the stability and reliability of the hoist control system in the mine. With the development of power electronic and automation technology, using AC-DC-AC variable frequency synchronous motor drive control scheme combined with the PLC technology, it is a very ideal strategy for ABB AC-AC converter hoist control system. In this paper, the deficiencies of original hoist system in Chengjiao mine, localization transformation of the system by adopting the scheme, the field operation and application proves that the localization reform scheme has great application and popularization value.

Key words: AC-AC frequency converter, hoist, localization, reliability