| 摘要 |
PROBLEM TO BE SOLVED: To move a basket of a dumbwaiter by the arbitrary quantity by providing an operation command releasing means to release the holding of the operation command to be inputted in an operation control circuit in a manual operation mode. SOLUTION: Because a safety relay 6 is not excited by opening a manual operation mode contact 30A, a safety contact 6B is kept opened, and a manual operation mode contact 6A is kept closed. When the manual operation mode contact 6A is thus closed, an operation starting relay 9 is excited even unless a door switch 7 is forcibly short-circuited. Each operation starting contact 9B of an elevating operation control circuit 27 and a lowering operation control circuit 28 is closed. When an UP-button 10 is depressed to excite an elevating operation starting relay 12, the cage is elevated. When a DOWN-button 16 is depressed to excite a lowering operation starting relay 17, the cage is lowered. |
