The forward reverse motor control is used i a system where forward and backward or upward and downward movement in the operation are needed. An example of which are shown in figures below (a) and (b). Figure below (a) shows forward and backward lateral movement of an overhead crane driven by motor M. Figure below (b) shows a downward and upward movement of a load is driven by motor lifter M. (a) Lateral movement of an overhead crane driven by a motor. (b) Vertical movement of a lift by a motor. Control Operation The clockwise (forward) and counterclockwise (reverse) rotation of a motor can be caused by interchanging the connection of any of the two of its three terminals. Figures (c) and (d) below will show how this can be done. Contractors F and R are interlocked. It means that if the contacts (1-2, 3-4, 5-6) of contractor R can not be closed. On the other hand if the contacts (1-2, 3-4, 5-6) of contractor R are closed, contacts (1-2, 3-4, 5-6) of contractor F can not be closed. Not...