After adopting the unit tandem variable-frequency
drive of Honeywell, the belt conveyor (710kW/6kV) of the main inclined shaft of
Shenmu Coal Industry Shiyaodian Mining Limited has not had any failure for a
year. Running reliable and stable operation, the variable-frequency drive has
won the recognition of the user in many areas with its high price/performance
ratio. Adopting speed sensorless vector control,
the power unit tandem HV variable-frequency drive solves the key
problems faced by long-distance conveyors with intermediary driver in a desired
manner. With its technical indexes and outstanding performance, it will sure
become a prevalent and preferred driving method for the conveyor of main shaft.