Apparatus for controlling an elevator

Details Apparatus for controlling an elevator Apparatus for controlling an elevator

1986-01-14

1987-07-21

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

G05B 1500

Patent

active

046811907

ABSTRACT:
In an elevator controller employing a microcomputer (MPU) for executing several kinds of controls, the MPU supplies an operation checking signal to an MPU checking circuit simultaneously with the operation of a starting contactor or relay, and, if a response to the operation checking signal is not fed back to the MPU within a predetermined time, the MPU recognizes an abnormal condition of the MPU or of the MPU checking circuit and prohibits the elevators from starting to travel. The checking operation of the MPU and the MPU checking circuit is executed each time the starting relay or contactor operates.

REFERENCES:
patent: 921646 (1911-05-01), Larson
patent: 4210226 (1980-07-01), Ichioka
patent: 4456096 (1984-06-01), Kajiyama
patent: 4468768 (1984-08-01), Sunkle et al.
Texas Instruments Inc. type SN 74LS123, pp. I 8-76 and I 8-77.

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