PFTL101A 1.0KN 3BSE004166R1使用区域

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 传统桥式起重机的电力拖动系统采用交流绕线转子异步电动机转子串电阻的方法进行起动和调速，继电—接触器控制，这种控制系统的主要缺点有： 1.1 桥式起重机工作环境恶劣，工作任务重，电动机以及所串电阻烧损和断裂故障时有发生。 1.2 继电—接触器控制系统可靠性差，操作复杂，故障率高。 1.3 转子串电阻调速，机械特性软，负载变化时转速也变化，调速不理想。所串电阻长期发热，电能浪费大，效率低。要从根本上解决这些问题，只有彻底改变传统的控制方式。 年来，随着计算机技术和电力电子器件的迅猛发展，电气传动和自动控制领域也日新月异。其中，具有代表性的交流变频装置和可编程控制器获得了广泛的应用，为PLC控制的变频调速技术在桥式起重机拖动系统中的应用提供了有利条件
The traditional electric drive system of bridge crane adopts the method of AC wound rotor asynchronous motor rotor series resistance for starting and speed regulation, relay contactor control. The main disadvantages of this control system are as follows: 1.1 the working environment of bridge crane is bad, the work task is heavy, and the electric motor and the series resistance burning and fracture faults occur from time to time. 1.2 relay contactor control system has poor reliability, complex operation and high failure rate. 1.3 rotor series resistance speed regulation has soft mechanical characteristics, and the speed also changes when the load changes, so the speed regulation is not ideal. The series resistance generates heat for a long time, resulting in large waste of electric energy and low efficiency. To fundamentally solve these problems, we can only completely change the traditional control mode. In recent years, with the rapid development of computer technology and power electronic devices, the field of electrical transmission and automatic control has also changed with each passing day. Among them, the representative AC frequency conversion device and programmable controller have been widely used, which provides favorable conditions for the application of PLC controlled frequency conversion speed regulation technology in the driving system of bridge crane