SYSTEM AND RELATED METHODS FOR DETECTING AND MEASURING THE OPERATIONAL PARAMETERS OF A GARAGE DOOR UTILIZING A LIFT CABLE SYSTEM

摘要

An internal entrapment system for a garage dooroperator (30), comprising a motor, a pulse counter (62) for de-tecting a speed of the garage door (12), a potentiometer (56) fordetermining a plurality of positional locations of the garage door(12), and a control circuit (50) for calculating a motor torquevalue from the speed for each of said locations to compare withdoor profile data points, wherein said control circuit (50) takescorrective action if the difference between the motor torque valuefor each of said locations and said door profile data points ex-ceeds a predetermined threshold, and otherwise updates said doorprofile data points to the motor torque values. In another embod-iment both speed and position are detected by a slider element(58) which is connected to the control circuit (50). A closed looplift cable system (100) may be employed.