The 180° Turnaround Unit must be part of every conveyor that uses Drive Unit. The Turnaround unit serves as the automatic cable tension take up on the slack side of the conveyor circuit. It also serves to complete the conveyor circuit by turning the cable 180° in a multi-corner circuit conveyor and a parallel tube conveyor. If the cable tension becomes too high (cable is too tight) or if the slack becomes excessive (cable is too loose), an electrical limit switch shuts off the electric motor..