Model BPJ4/5 Mine-used Frequency-converter with Flameproof and I.S. for AC Motor, with its core parts imported from ABB, is a new kind of mine-used frequency-converter for 1140 V motor.

The frequency-converter utilizes technology of direct torque control, suitable for AC 1140 V and 50 Hz power supply system, can adjust speed of three-phases AC motor of and under 350 A, realize smooth start, stop and speed adjusting of motors with various loads, and completely eliminate mechanical and electrical shock and extends equipment's life.

The frequency-converter utilizes advanced vacuum heat-pipe dissipation technology, compared to water or oil dissipation, it needs less maintenance and it is more suitable for severe environment in mine underground and effectively resolves dissipation problem of high-power modules.

The frequency-converter has flexible control modes of frequency-converted starting and running, frequency-converted starting and industrial frequency running, direct starting and running under special condition. It has communication interfaces for local, remote and centralized control. It has power balance adjustment function for automatic adjusting power balance of multiple motors, without help of speed-control hydraulic coupler, CST or other mechanical equipment. It can realize energy-saving running, that is, according to real load, automatically control rotation speed of motor and reduce wear of motor. It has simple structure, with square flameproof casing, fast-open door structure, exchangeable handcart-type vacuum contactor, very convenient for installation, checking and maintenance.