| 摘要 |
A SET OF ELEVATORS, E.G. AN ELEVATOR GROUP, IS CONNECTED TO A COMMON POWER SUPPLY (201). THE ELEVATORS ARE CONTROLLED BY A COMMON CONTROL SYSTEM (507) SO THAT AN ELEVATOR CAR HAVING STOPPED IS PREVENTED FROM BEING DISPATCHED IN THE UP DIRECTION IF, OF THE ELEVATOR CARS OF THE ELEVATORS CONNECTED TO THE COMMON POWER SUPPLY (201), MORE CARS ARE MOVING UPWARDS THAN ARE MOVING DOWNWARDS.
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