| 摘要 |
PROBLEM TO BE SOLVED: To provide a display device of a liquid level warning light in a construction machine or the like which does not issue an alarm to an operator in the case of the occurrence of a deviation from a prescribed liquid level of oil but that the deviation will return to a normal level in a relatively short time. SOLUTION: A circuit for warning light display comprises a D.C. power source 71; an ignition switch 72; a first electromagnetic relay 73 having a normally-open contact; a second electromagnetic relay; and a third electromagnetic relay 79 having a normally-closed contact. The circuit for warning light display further comprises a first delay circuit 76 having an input terminal E1, an input terminal E2, a transistor Tr1, and a CR time constant circuit; a second delay circuit 77 having a similar configuration; a level sensor 78; and an warning display light 80. Even when the liquid level of the level sensor varies at a period shorter than the delay time of the first and second relay circuits to turn the sensor on and off, the warning display light remains off. An operator of an construction machine is not thereby troubled by the flashing of the warning display light. COPYRIGHT: (C)2011,JPO&INPIT |
