Apparatus for controlling elevator door based on power source vo

Details Apparatus for controlling elevator door based on power source vo Apparatus for controlling elevator door based on power source vo

1991-02-28

1992-12-29

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187109, 187114, 187130, B66B 1314

Patent

active

051754002

ABSTRACT:
An apparatus for controlling an elevator door based on controlling an electric motor for driving the door with a microcomputer and resetting the microcomputer when the power supply fails has a voltage monitor which detects the power source voltage and a braking circuit forcibly brakes the motor if the power source voltage detected by the voltage monitor is lower than a prescribed voltage. The motor is forcibly braked when the detected power source voltage is between the prescribed voltage and the lower limit of the range of voltages at which the microcomputer can operate.

REFERENCES:
patent: 3814214 (1974-06-01), Booker, Jr.
patent: 4051419 (1977-09-01), Takahashi
patent: 4227137 (1980-10-01), Hartman
patent: 4300663 (1981-11-01), Hmelovsky et al.
patent: 4776433 (1988-10-01), Lagree et al.
patent: 4815567 (1989-03-01), Ikesima
patent: 4982816 (1991-01-01), Doi et al.
patent: 5070290 (1991-12-01), Iwasa et al.

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