目前国内港口的许多门座起重机（以下简称门机）已采用可编程序控制器（以下简称ＰＬＣ）及变频调速控制技术，新技术的使用不仅克服了传统的继电器控制的缺点，而且使系统的可靠性得到了提高，同时亦给维护人员提出了更高的要求。中文液晶显示器以中文的方式显示出系统发... At present, many portal cranes in domestic ports (hereinafter referred to as door machines) have adopted programmable logic controller (hereinafter referred to as PLC) and frequency conversion speed control technology. The use of new technologies not only overcomes the shortcomings of the traditional relay control but also enables the system The reliability has been improved, but also to the maintenance staff made a higher request. Chinese liquid crystal display Chinese way to show the system hair ...