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

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

The frequency-converter utilizes advanced technologies of ventilation fan and vacuum heat-pipe dissipation, 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. It has three modes of frequency convert starting and running, frequency convert 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 of multiple motors, without help of speed-control hydraulic coupler, CST or other mechanical equipment; it can realize energy-saving running with 4~20 mA current or 0~10 V voltage supplied by outer sensor, 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.