The actual load is compared to four limit values, and by achieving the limit value, the relay of the cranecontroller could be switch.
实际的装载量靠近极限值的同时，又不断与四个极限值相比较。起重机控制电容可以作为开关。
2
Crane operation of the various agencies to rely on the program control device to achieve, and now more than the use of a crane to control the programmable controller.
起重机各机构的运行要依靠程序控制装置来实现，现在起重机多使用可程序控制器来控制。
3
As to the horizon motion system of Bridge Crane is a nonlinear, variation parameter and strong coupling system, the nonlinear PID controller is used for positioning and anti-swing.