| 摘要 |
PURPOSE:To lift an elevator cage to a floor where a hall call button is pushed even during replacing work of a first relay in response to the hall call button by installing a buffer device which connects the hall call button to a second relay with the power-off operation of a circuit comprising the hall call button and the first relay. CONSTITUTION:At time of replacement due to secular deterioration in first relays 1U, 2D, 2U and 3D, a power source of circuit comprising these first relays 1U, 2D, 2U, 3D and hall call buttons 1BU, 2BD, 2BU, 2BD is turned to OFF. At time of off-operation of this power source, a switch 11 of a buffer device 10 is turned to OFF. With this, for example, when the button 1BU is pushed, a current flows in a third relay 1UX, exciting this third relay 1UX, through which a contact 1UXa is turned to ON, exciting a second relay 1b, and a contact 1C is turned to ON, thereby holding the second relay 1b, and then an elevator cage is lowered to a first floor. |
