Inverter winch pumping station control system application In the hot-rolled production, rough mill, finishing mill, laminar cooling, coiler and other rolling equipment consumption of a large number of industrial water by rolling gut confluence to the coiler Pit set pool, by the hoist pump pumping two large water pumping system to the sewage treatment system for recycling. Winding machine of a hot-rolled mill winch pumping station control system originally used a simple logic control relay, through the two float detection high and low water level, frequent start and stop the pump to achieve automatic pumping. The design flow of the two pumps in the pumping station is considered according to the maximum flow of the pumping station plus a certain margin. However, in actual production, the actual flow of the pumping station is often less than the maximum flow rate, which results in extremely short working hours of the pump , Stop frequently. After putting into production, hoisting pumping stations often appear frequent pump damage, can not be normal pumping, winding machine underground 7 # hydraulic station is often flooded, endangering the station electrical equipment, resulting in the coiler can not work properly, seriously restricting the production Work properly. (1) The control system uses relay control, the fault point is more; (2) The crater pit environment is harsh, the reliability of the float ball detection level is poor, frequent faults often lead to failure of automatic pumping function; (3) Control system uses relay control, frequent start and stop large pumps, seriously affecting the service life of the pump, resulting in frequent pump damage; (4) no water level indication. With the development of AC speed regulation technology, the introduction of all digital frequency conversion device products has provided a vast space for the application of AC drive. The use of AC variable frequency speed control can not only achieve a smooth pump start, but also can make the pump flow to be adjusted. After the investigation of AC speed control at home and abroad, we decided to use ABB ACS504 digital AC frequency conversion equipment to digitize the control system of the winch pump station, and changed from open-loop control to closed-loop control to realize level control and suppression Frequent start of the pump to overcome the original system defects. A system composition and working principle 1.1 System Components ACS504 full digital AC inverter main circuit by the rectifier bridge, intermediate filter and inverter circuit 3 parts. Rectifier bridge using three-phase bridge half-controlled rectifier circuit; intermediate filter by the reactor L11 and capacitor C14-C16 composition; inverter circuit includes six IGBT insulated-gate bipolar transistor. Control loop from the control interface board, the main circuit interface board, motor control board and input protection board. 1.2 System software features ACS504 digital AC inverter software software is divided into starting data parameters, operating data parameters, control connection parameters, transmission parameters, protection parameters. According to different occasions of using frequency conversion device, the above parameters are pre-programmed into different application macro programs. The application macro program is a pre-programmed parameter set stored in the EPROM of the motor control board. These are factory default settings, manual / automatic control, PI control, constant torque control, sequence control and PFC control. They enable users to start the drive faster and easier. Debug and monitor with control panel and computer. In hoisting pump station application control, according to hoisting pump station process needs, using PFC control application macro program.