The actual load is compared to four limit values, and by achieving the limit value, the relay of the crane controller 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
The device can realize the automatic and continuous telescopic motion of the suspension arm of the crane only by flipping one switch.
本实用新型只需扳动一个开关，起重机吊臂的 伸缩动作可自动连续完成。
3
Aiming at the shortage of conventional overhead travelling crane control system, the application of a novel control and protective switch in innovation for overhead travelling crane was introduced.