| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric circuit of a construction equipment capable of mounting greater number of control devices in small number of output ports of a controller installed in a cabin. <P>SOLUTION: In a lever lock operation, a mechanical operation becomes impossible when a lever lock switch is in an OFF condition, and in a non-excitation state of a control coil 6a, a contact point a and a contact point b of a switching relay 6 become conductive. Thus, an output signal from a controller 1 passes through the contact point a and the contact point b of the switching relay 6 and is input into a first control unit 4 to realize an A function (an automatic stoppage of an oil supply pump). The mechanical operation becomes possible when the lever lock switch is turned into an ON condition by a lever lock operation, and the contact point a and a contact point c become conductive by excitation of the control coil 6a. Thus, the output signal from the controller 1 passes through the contact point a and the contact point c of the switching relay 6 and is input into a second control unit 5 to realize a B function (a free swing function). <P>COPYRIGHT: (C)2012,JPO&INPIT |
