Run and safety micro switches

The alignment of a Pivot system is controlled by a mechanical linkage. This linkage senses the relative position of two adjacent spans and actuates the lever arm attached to a small switch in the tower control box.

When the linkage senses a position that requires a tower movement to mantain proper alignment, 120 VAC is sent through the micro switch to the tower contactor coil. The contactor points close and the motor is energized. The tower moves until the sensing linkage changes the state of the microswitch, which then interrupts the electricity to the contactor. The contactor opens and the motor stops.