Display apparatus for a first out type of fault status annunciator having a series string of interlock switches

An annunciator for the status of interlock switches connected into a series circuit for supplying power from a power source to a load, includes a memory recording the status of each switch at a selectable instant. A plurality of display elements are arranged in a pattern corresponding to the pattern...

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Bibliographic Details
Main Authors PAUL B. PATTON, GREGORY J MERTEN
Format Patent
LanguageEnglish
Published 30.12.1993
Edition5
Subjects
ALARM SYSTEMS
BLASTING
COMBUSTION APPARATUS
COMBUSTION PROCESSES
HEATING
LIGHTING
MECHANICAL ENGINEERING
ORDER TELEGRAPHS
PHYSICS
REGULATING OR CONTROLLING COMBUSTION
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
WEAPONS
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Summary:An annunciator for the status of interlock switches connected into a series circuit for supplying power from a power source to a load, includes a memory recording the status of each switch at a selectable instant. A plurality of display elements are arranged in a pattern corresponding to the pattern of the interlock switch circuit. A manually operable switch allows a user to select for graphically showing with the display either the switch status recorded by the memory or the current status of the switches. The signals controlling the display are conditioned so that the particular display element assigned to the first out switch as recorded in the memory flashes to indicate the switch closest to the power source which was not conducting at the selectable instant.
Bibliography:Application Number: AU19930044042