| 摘要 |
A method for monitoring the operation of a mechanical safety switch in a moving barrier. A typical application is the verification that the edge sensor of a garage door correctly senses an obstruction. A trouble indication is generated if the sensor switch does not operate when the door has reached its fully closed position, at which point the safety switch should be engaged by the floor against which the door presses. In those systems in which a signal representative of the door position is not available, a trouble indication is generated if the sensor switch does not operate at least once during a predetermined number of door close activations.
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