IWHS Elevator Controller Study.
Final rept. 12 Apr-1 Nov 78,
NAVAL RESEARCH LAB WASHINGTON D C
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A study has been performed to determine the optimum replacement for the present automatic controller of the IWHS Elevators on Aircraft Carriers CV 59 through CV 64. The task of selecting a replacement controller was precipitated by the lack of spare parts for, and the poor maintenance of, the present controller. Design approaches based on relay logic, semiconductor logic, and programmable controllers were evaluated with respect to reliability, maintainability, equipment supportability, standardization, human interface, failsafe operation, and life cycle cost. It was determined that a controller based on electromechanical relays rated highest with respect to reliability, maintainability, equipment supportability, standardization, human interface, and life cycle cost. With respect to failsafe operation, the relay based controller had a respectable rating. The unexpected high rating of relay logic compared to semiconductor logic and programmable controllers is attributed to two factors the usage rate of the IWHS elevators is compatible with relay reliability, and the relay controller has been demonstrated to be highly maintainable by the assigned maintenance personnel. Author
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