三种用PLC控制的防止相间短路的电动机正反转控制电路

Three positive and negative rotary-controlling circuits of motors using PLC control to prevent short circuit between phases

采用可编程序控制器(简称PLC)控制技术,通过增加一个接触器或两个PLC内部时间继电器或硬接线 的方法对电动机的正反转控制线路进行改进,可以有效地防止电动机正反转换接过程中的相间短 路。阐述其系统主要硬件和软件控制。

Using Programmable Logic Control (PLC) technology , we proposed three improved positive and negative rotary-controlling circuits by adding a contactor or two PLC internal time -relays to the original circuit or by using hardware connection, which can prevent short circuit between phases effectively during the conversion between the positive and negative rotary. The main hardware and software control of the system were expatiated.