| 摘要 |
<p>PURPOSE: To automatically operate an additional motor in response to the increase of load without generating time delay. CONSTITUTION: When a hydraulic main load motor M1 drives a load, the operating pressure to be generated inside thereof is raised with the increase of load. When the operating pressure achieves the upper limit value, a hydraulic additional motor M2 is additionally connected. Since the pressure is lowered at the time of connecting the additional motor, a control device switches the additional motor to the non-operation again when the operating pressure achieves the lower limit value, and the lower limit pressure is smaller than a half of the upper limit pressure. Continuous changeover of the additional motor can be avoided by this switching hysteresis.</p> |
