| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device for hydraulic elevators, which is independent of variations in the differences, etc., between hydraulic apparatuses, and in which stable relief characteristic can be constantly obtained. SOLUTION: When the pressure value of a pressure sensor 16 exceeds a pressure value of relief operation, which is set by a microcomputer of a control device 12, the control device sets the valve current command value given to a proportional solenoid (AU valve) for determining the opening of an increasing flow control valve 20 to 'zero', and operates the increasing flow control valve 20 to perform electric relief operation to return oil to a tank, and then reduces override to improve the relief characteristic. |
