| 摘要 |
PURPOSE:To raise the efficiency of operations by driving a maximum revolving number varier and a maximum discharge volume varier according to set values by a setting and selecting means on the basis of output signals from a discriminator, and indicator, and a sensor. CONSTITUTION:Output signals of switches 32 and 33 and output signals of pressure switches 34a and 34b are put in the arithmetic unit of a controller 35. In the arithmetic unit, the first discriminator checks whether or not traveling condition is preferentially set, e.g., whether or not a traveling motor 1 is in operation on output signals from the pressure switch 34a. In the case of traveling condition, a maximum revolving number varier 30 and a maximum discharge volume varier 1 are driven according to indications of heavy excavation (P- mode), light excavation (E-mode), high-speed traveling (H-mode), and low-speed traveling (L-mode) by the switches 32 and 33. In the case of either no-traveling or no other operation, whether or not the switcher 32 is switched is checked by the second discriminator. When the switch 32 is switched, P-mode or E-mode is selected according to indication of the switch 32. |
