crane. Hoist power supply overload protection and magnetic contactor fault detection device

摘要

The present invention relates to an apparatus for operating a crane / hoist including power supply means, a main switching means, a limit position control means, and a failure detecting / resetting means, Overload operation to overload the hoist, overload operation to detect contact welding of electric contactor and faulty cable insulation, and crane / hoist power to automatically shut off power supply when faulty operation occurs by installing a magnetic contactor fault detection device The present invention relates to an apparatus for detecting an overload of a power supply and an electronic contactor, and more particularly to an apparatus for detecting a load current of the power supply, an electromagnetic contactor exciting current constituting the main switching means, A control output according to a comparison / judgment result of each detection current is inputted to the respective means and the failure detection / Of it made by further comprising an overload protection / fault detection means for outputting a control switch (relay).