| 摘要 |
PURPOSE:To prevent the lowering of the operating speed of an elevator and the worsening in riding quality by providing an informing means for informing the lowering of oil viscosity at the time of judging that the oil viscosity is lowered below a defined value even though an oil temperature is in a defined temperature range. CONSTITUTION:Oil temperature is monitored by an oil temperature detecting means 16 while always monitoring oil viscosity by an oil viscosity detecting means 15. When the oil viscosity is abnormally lowered even though the oil temperature is within the range of ordinary values, the lowering of viscosity is informed to an operator by an informing means, to demand to change of oil 14 in an oil tank 10 and other operations. As a result, the lowering of the operating speed of an elevator and the worsening in riding quality can be prevented. |
