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 detecting a speed of the garage door (12), a potentiometer (56) for determining a plurality of positional locations of th e 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 th e difference between the motor torque value for each of said locations and sai d door profile data points exceeds a predetermined threshold, and otherwise updates said door profile data points to the motor torque values. In another embodiment both speed and position are detected by a slider element (58) whi ch is connected to the control circuit (50). A closed loop lift cable system (100) may be employed.