Frequency inverter in hoist
During January to May of 2008, the hoisting unit consumption was 2.92 kilowatt hour/t; during January to May of 2009, the hoisting unit consumption was 1.66 kilowatt hour/t. The unit consumption had decreased by 1.26 kilowatt hour/t, and the decrease rate of unit consumption was 43.15%. In 2008, 132,334 tons of ores were lifted, 166,700 kilowatt hours of electricity were saved, and in accordance with the electricity price of RMB 0.528yuan/ kilowatt hour, an electricity cost of 88,040 Yuan has been saved.

After the frequency inverter system has been put into operation, the winch operates more convenient and runs more stable, the temperature and noise of the winch control room have been greatly improved, which provides a great environment for the operator.