Working theory
Safety edge is made of conductive compound copper wires of upper and lower two parts.They separate at a certain distance when not squeezed.
Tehe two parts connect with end pieces and sensor processor in a series,when the safety edge be squeezed,the two parts of upper and lower contact,which lead a circuit cycle,the resistance and current change,the sensor processor received this detect this change and pass signal to the controllers,The controllers will achieve the settled functions suc as:
1)door or windows stop immediately
2)run back till upper limit
3)run back for settled seconds before stop.
