DEVICE FOR CONTROLLING DOOR OF ELEVATOR

PURPOSE:To prevent a door to open outside a door zone and ensure the safety of an elevator by preventing a door close signal by the output signal from a riding place nonengagement detecting means and providing a door open signal preventing means which generates a door close command signal on a door control system. CONSTITUTION:The difference signal V2 of a differential amplifier 20 is compared with a reference voltage for a certain time from the start of door open by a riding place nonengagement detecting circuit 24. When the difference signal V2 is below the reference voltage, an engaging device is not engaged with a riding place door side while judging that only a cage door is opening outside a door zone, and a door open signal preventing circuit 25 is operated to invert an erroneously generated door open command signal to a door close command signal, and closing the driving circuit 17 of a door motor 6. As a result, even if a door open command signal is generated outside the door zone due to the failure of the door opening/closing command signal generating circuit 23, etc., the cage door will not be opened outside the door zone because of this, ensuring the safety of an elevator.