Industrial door system responsive to an impact

A door including a system responsive to a force above a certain magnitude being exerted on the door, wherein during a normal operation of the door, the door is moveable between an open position and a closed position relative to a doorway opening at least partially defined by a lateral edge, and comprising in combination:

• a vertically-extending member disposed adjacent to the lateral edge of the doorway opening;
• a first member associated with the vertically-extending member;
• a door panel capable of movement between the open position and the closed position;
• a sensing circuit adapted to sense the force exceeding the certain magnitude;
• and including a conductor releasably coupled to the first member such that the conductor and the first member have a coupled state and an uncoupled state, wherein the conductor and the first member are in the coupled state and move together during the normal operation of the door to place the conductor and first member in electrically conductive contact with each other such that current is conducted through the coupled conductor and the first member, and wherein the conductor and the first member are otherwise in the uncoupled state wherein they are capable of independent relative movement to electrically separate the conductor from the first member.

A method of controlling an electrical current used to signal the separation of a breakaway coupling that selectively couples and uncouples a roll-up panel to a carriage, wherein the carriage travels along a track to help guide the roll-up panel, comprising:

• conveying the electrical current through the breakaway coupling;
• uncoupling the roll-up panel from the carriage by way of the breakaway coupling;
• and
• sensing the interruption of the electrical current through the breakaway coupling upon uncoupling the roll-up panel from the carriage.