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 door operator (30), comprising a motor, a pulse counter (62) for de- tecting a speed of the garage door (12), a potentiometer (56) for determining a plurality of positional locations of the garage door (12), and a control circuit (50) for calculating a motor torque value from the speed for each of said locations to compare with door profile data points, wherein said control circuit (50) takes corrective action if the difference between the motor torque value for each of said locations and said door profile data points ex- ceeds a predetermined threshold, and otherwise updates said door profile 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 loop lift cable system (100) may be employed.