High-pressure soft-start and PLC are widely used in coal mine drainage to the electronic control system. The method is in a constant exchange between the squirrel cage induction motor access SCR as AC voltage controller. Way to start a constant current induction motor dragged into the normal operation of state. In this paper, as the host PLC, the high-voltage soft-start (Reactor standby) launched the programme for mine drainage electronic control system. Relay control systems and conventional difference between the use of PLC. PLC overcome the relay size, reliability is not high, and change control procedures trouble maintaining large, in particular, timing and other shortcomings imprecise. The launch of direct and conventional power reactor or start using high-pressure difference between the soft start to overcome the boot (start Reactor) added directly to the motor rated voltage, fast startup, particularly on the power grid, the electrical, mechanical production of the harmful impact , And other shortcomings.
In this paper, the German Siemens S7-200PLC as a controller, using the Henan Institute of Zhuzhou railway locomotive production QJR-400 high-voltage AC motor soft start device to achieve speed, not only to improve the performance started, but also meet the requirements of the scene.