| 摘要 |
PURPOSE:To detect the failure of operation of an actuator by providing a switch to be ON-OFF operated by an indication voltage from a micro computer and an alarm to the power source circuit of a solenoid valve provided to the oil-pressure circuit of an oil-pressure actuator. CONSTITUTION:A solenoid valve 10 through which oil pressure is directed to a tank is provided to the oil-pressure circuit of an actuator 3 for an oil-pressure motor, etc., for slewing. To the power source circuit 22 of the solenoid valve 10, a switch 23 to be turned on by an operation indicating voltage V1 from a micro computer 20 and a confirmatory circuit 25 to generate an operation confirmation voltage V3 equal to the operation indicating voltage V1 form the micro computer 20 when the switch 24 is on by electrification of the solenoid valve 10 are provided. To an indication circuit 21 to the solenoid valve 10 from the micro computer 20 and the confirmatory circuit 25, at the time of the operation indicating voltage V1not equal to the operation confirmation voltage V3, a logical operation circuit 26 to operate the alarm 27 is connected. |
