The hoist in coal and non-ferrous metal mines is used for transport of workers, materials, ore and minerals, and regarded as one of the four important running equipments in mining. Traditionally, metal resistor is inserted in the circuit of motor rotor, and drum controller or contactor is used to cut off the resistor for speed regulation. The control devices are weak as below: high energy consumption of resistor, difficulty in heat dissipation; step speed regulation of resistor, open-loop control, narrow range of speed regulation, low precision and poor safety performance; power brake DC power supply or low-frequency power supply is required in the process of slowing down or lowering, thus causing damages to equipments and heavy consumption of electric energy. In addition, the original control system, incomplete in protection and poor in reliability, is a serious constraint on safety in production of mines. Therefore, manufacturers are badly expected to develop a new type drive system that is safe, reliable, high in performance and power saving. This full-digital variable frequency control system of mine hoist has basically solved all weak points of the original electrical system of resistance speed regulation, pushing the mine hoist drive system to a higher level.

Perfect drive technologies

▓ Drive system designed with HV-IGBT technology

▓ Good output characteristics;

▓ Basic characteristics of sinusoidal current

▓ Excellent torque characteristics to reduce motor loss;

▓ AFE technology to ensure four-quadrant operation of the system;

▓ 12 pulse/24 pulse power supply to guarantee a high power factor of the drive system;

▓ Automatic voltage compensation to ensure stable operation in weak grids.

▓ PLC of famous foreign brands (such as Simens, AB and Mitsubishi) for process and logic control;

▓ Manual/semi-automatic/full automatic operation and rope test;

▓ Able to change the hoisting speed according to the mode of operation (worker, coal or material hoisting)

▓ Variable redundancy protection for important events;

▓ Redundancy protection of software and hardware;

▓ Driving in the normal mode and emergency mode;

▓ Envelope protection of full travel speed to ensure reliable operation of the system;

▓ Full protection for the drive system, operation and monitoring system and gate control system;

▓ Fine or coarse disc type depth indicator

▓ Digital display of position and trend;

▓ Monitoring over operating condition of 6kV high-voltage incoming/outgoing line

▓ Monitoring over the process of hoist system;

▓ Displaying the operating principle of hoist;

▓ Monitoring over operating condition of hydraulic station;

▓ Displaying the operating speed and current tendency charts;

▓ Displaying the list of major and minor faults;

▓ Inquiry of historical faults;

▓ Output of operating records and fault reports;