Elevator door control device
Provided is an elevator door control device capable of safely closing a door of an elevator when a power failure occurs and preventing an extra burden from being placed on a rescue worker. The elevator door control device according to the present invention includes a door dynamic braking control circuit ( 15 ) that performs, when a power failure occurs in a condition in which the door of the elevator is in an intermediate position, dynamic braking control of a door motor ( 2 ) until full close of the door is detected and deactivates the dynamic braking control when the full close of the door is detected.
1 . An elevator door control device, comprising a door dynamic braking control circuit configured to:
perform, when a power failure occurs in a condition in which a door of an elevator is in an intermediate position, dynamic braking control of a door motor by at least operating a shorting circuit to cause a phase-to-phase short-circuit of the door motor until full close of the door is detected;
deactivate the dynamic braking control when the full close of the door is detected; and
a door control circuit configured to
stop an inverter circuit that supplies AC power to the door motor when the power failure occurs, and
suspend restarting the inverter circuit until the dynamic braking control is deactivated when the power failure recovers during a period from when the dynamic braking control is started to when the door full close is detected.
2 . The elevator door control device according to claim 1 , wherein the door dynamic braking control circuit is provided in an existing emergency control circuit.
3 . The elevator door control device according to claim 2 , wherein the door dynamic braking control circuit does not perform the dynamic braking control when an operation mode change-over switch is in a condition of a maintenance mode.
4 . The elevator door control device according to claim 1 , wherein the door dynamic braking control circuit does not perform the dynamic braking control when an operation mode change-over switch is in a condition of a maintenance mode.
5 . The elevator door control device according to claim 1 , further comprising a power failure detection circuit configured to detect the power failure.