Abstract: An automatic system for controlling a plurality of motors includes motor starting circuitry and motor stopping circuitry that serves to sequentially start and stop the motors in the same cyclic order. The starting circuitry has a sensing component for sensing the presence and absence of a condition that reflects the need for starting the motor and a master starting control component which develops two different states that are used in controlling the circuits of the starting circuitry. The control circuits include a plurality of motor starting circuits for starting the respective motors and a plurality of conditioning circuits that normally respond to one of the developed states for conditioning the starting circuits for response sequentially to the other of the developed states and in a cyclic order for starting the motors.

Abstract: For starting and stopping air injection, a pneumatic ejector for a liquid transport system typified by a municipal sewerage system is provided with an air release valve fitted with a limit switch as a control device.