Aiming at the defects of the monitoring and protection function of the lack of operation button switch on and contactor main contact adhesion in the non-operation state of the electric single-beam crane,by adding a monitoring loop composed of time relay in the control circuit,with the help of the logical relationship between the normally closed contact of the running button of each function and the normally open contact of the contactor corresponding to this function in the running process,the monitoring and protection function of the hidden danger such as running button switch in no operation state and contactor main contact adhesion are realized.
Electric single-beam craneContactorFailure analysis
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