Wiring error detector for door operator

Details Wiring error detector for door operator Wiring error detector for door operator

1993-12-08

1995-01-24

Pellinen, A. D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

49 28, 318286, E05F 1510, E05F 1520, H02H 708

Patent

active

053844955

ABSTRACT:
A door operation control system has a door opening for moving a door between open and closed positions. A door operator control circuit selectively operates the drive means to move the door between the open and closed positions. An obstruction detection device detects whether there is an obstruction in the path of the door between the open and closed positions and generates a signal in response thereto. The obstruction detection device is connected to the control circuit by wiring to permit operation of the door opener in the absence of a signal from the obstruction detection device and to prevent certain operations of the door opener in the presence of a signal from the obstruction detection device. An error detection circuit detects faults or errors in the wiring and generates a signal to prevent certain operations of the door operator when the faults or errors are detected. The error detection circuit prevents unsafe operation of the door opener if a wiring error has made the obstruction detection device inoperative.

REFERENCES:
patent: 3742222 (1973-06-01), Endl
patent: 3854089 (1974-12-01), Emler
patent: 4304375 (1981-12-01), Builta et al.
patent: 4386398 (1983-05-01), Matsuoka et al.
patent: 4449080 (1984-05-01), Konrad et al.
patent: 4758837 (1988-07-01), Fruhwald
patent: 4764759 (1988-08-01), Braun et al.
patent: 4916570 (1990-04-01), Dale
patent: 4962350 (1990-10-01), Fukuda
patent: 5029278 (1991-07-01), Topmiller

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