Application Research Of The Frequency Conversion Control System Use On Mine Hoist Based On PLC

The mine hoist is the most important key equipment in the mine and it shoulders the responsibility of transporting ore,material and people.Tranditional TDK electric control system is used in tranditional control system,and uses cascade speed regulation as its control pattern.Thus,large AC contactors and DC timing relay are usually used in control system,but the control circuit is complicated and has a low performance of speed regulation.This kind of control system has many shortcomings,such as low reliability,complex operations,high failure rate,high waste of electric power and inefficiency.So it is vital to do research on hoist control system.With the continuous development of computer and PLC technology,it has become imperative to change the tranditional equipment of mine by using advanced control technology. It not only improves the control performance of mine hoist,but also makes the whole control system to be a high level in automation,safety and reliability.This paper makes an modification to existed speed control system based on vector control and frequency control. The whole hardwares of mine hoist control system are made of transducer,programmable controller,driver platform,supervisory system and the part of mechanical transmission.Considering the wretched conditons where the control system is used,I adopt some measures on protection and anti-jamming.In the course of designing the software,recovery processing block is added to the system so as to improve the safety and reliability of operating system.Mine hoist frequency converter control system based on PLC has being used more than a year in YuLin.The application of the control system shows that the control system designed in this paper has high reliability,apparent effect of energy conservation and it is easy to use.