When the crane is in the zero-speed zero-load the self zero-tracking will act and zero drift of the detecting system can be corrected .

设计了零速 空载零 位自辨识跟踪技术， 消除了检测系统的零点漂移影响。

Moreover this kind of pumping unit can be started in the condition of zero-load and run in the condition of full-balance .

该机整机结构简单、受力均匀、运行平稳、可靠性高，并能实现完全 平衡 和 空载启动。