What’re the adjustment to the power-cut limiter of gantry crane?
The process of adjustment is realized through regulating the two bumping blocks on the position-limiting bars. 
The methods are as follows: loosen their bolts, and the blocks lie on different sides of the rope guide so that
blocking board can push the blocks freely. When the lifting motor starts, the board pushes the top block to
move till the space between the case top edge of the hook pulley and the shell bottom edge of the roller is in
the scope of 150mm-50mm. at the moment, stop and click the falling button. When the rope guide moves
back 10mm or so, stop and make the tope block approach the blocking board. Finally, tighten the bolts
the adjustment of power-cut limiter of gantry crane to the bottom limit position is as the above except the
opposite direction or more circle of wire rope should be left on the roller when the hook falls to the lowest point.
After the adjustment, try to lift for several times to verify whether the top-and-bottom limited positions meet relevant requirements
