Wiring error detector for door operator
First Claim
1. A door operator system comprising:
- a door opener for opening and closing a door across a doorway;
a control circuit for operating the door opener, the control circuit having an input for receiving a first signal indicating the presence of an obstruction in the doorway and a second signal indicating the absence of an obstruction in the doorway;
an obstruction detection means for sensing obstructions in the doorway, the obstruction detection means having an output for sending a third signal indicating the presence of an obstruction and a fourth signal indicating the absence of an obstruction;
an error detector circuit connected between the control circuit and the obstruction detection means, the error detector circuit providing the first signal on the control circuit input when the third signal is received on the obstruction detection means output, the error detector circuit providing the second signal on the control circuit input when the fourth signal is received on the obstruction detection means output, the error detector circuit and the obstruction detection means providing a splitter circuit connected to the output of the obstruction detection means for maintaining the fourth signal on the obstruction detection means output within a predetermined range of signals during normal operation of the obstruction detection means, the error detector circuit including a signal sensing circuit for sensing if the signal received on the obstruction detection means output is outside the predetermined range and for providing a first signal on the control circuit input when the signal on the obstruction detection means output is outside the predetermined range, whereby a short circuit or an open circuit in the obstruction detection means output results in the first signal on the control circuit input.
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Accused Products
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.
29 Citations
9 Claims
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1. A door operator system comprising:
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a door opener for opening and closing a door across a doorway; a control circuit for operating the door opener, the control circuit having an input for receiving a first signal indicating the presence of an obstruction in the doorway and a second signal indicating the absence of an obstruction in the doorway; an obstruction detection means for sensing obstructions in the doorway, the obstruction detection means having an output for sending a third signal indicating the presence of an obstruction and a fourth signal indicating the absence of an obstruction; an error detector circuit connected between the control circuit and the obstruction detection means, the error detector circuit providing the first signal on the control circuit input when the third signal is received on the obstruction detection means output, the error detector circuit providing the second signal on the control circuit input when the fourth signal is received on the obstruction detection means output, the error detector circuit and the obstruction detection means providing a splitter circuit connected to the output of the obstruction detection means for maintaining the fourth signal on the obstruction detection means output within a predetermined range of signals during normal operation of the obstruction detection means, the error detector circuit including a signal sensing circuit for sensing if the signal received on the obstruction detection means output is outside the predetermined range and for providing a first signal on the control circuit input when the signal on the obstruction detection means output is outside the predetermined range, whereby a short circuit or an open circuit in the obstruction detection means output results in the first signal on the control circuit input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification