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Title: ''Smart'' watchdog safety switch

Abstract

A method and apparatus for monitoring a process having a periodic output so that the process equipment is not damaged in the event of a controller failure, comprising a low-pass and peak clipping filter, an event detector that generates an event pulse for each valid change in magnitude of the filtered periodic output, a timing pulse generator, a counter that increments upon receipt of any timing pulse and resets to zero on receipt of any event pulse, an alarm that alerts when the count reaches some preselected total count, and a set of relays that opens to stop power to process equipment. An interface module can be added to allow the switch to accept a variety of periodic output signals. 21 figures.

Inventors:
Issue Date:
OSTI Identifier:
7083830
Patent Number(s):
5054023 A
Application Number:
PPN: US 7-350953
Assignee:
PTO; EDB-94-111372
DOE Contract Number:  
AC09-76SR00001
Resource Type:
Patent
Resource Relation:
Patent File Date: 12 May 1989
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ON-LINE SYSTEMS; SWITCHES; DESIGN; OPERATION; ALARM SYSTEMS; ELECTRIC FILTERS; MONITORING; SWITCHING CIRCUITS; TIMING CIRCUITS; ELECTRICAL EQUIPMENT; ELECTRONIC CIRCUITS; EQUIPMENT; FILTERS; 426000* - Engineering- Components, Electron Devices & Circuits- (1990-)

Citation Formats

Kronberg, J W. ''Smart'' watchdog safety switch. United States: N. p., 1991. Web.
Kronberg, J W. ''Smart'' watchdog safety switch. United States.
Kronberg, J W. Tue . "''Smart'' watchdog safety switch". United States.
@article{osti_7083830,
title = {''Smart'' watchdog safety switch},
author = {Kronberg, J W},
abstractNote = {A method and apparatus for monitoring a process having a periodic output so that the process equipment is not damaged in the event of a controller failure, comprising a low-pass and peak clipping filter, an event detector that generates an event pulse for each valid change in magnitude of the filtered periodic output, a timing pulse generator, a counter that increments upon receipt of any timing pulse and resets to zero on receipt of any event pulse, an alarm that alerts when the count reaches some preselected total count, and a set of relays that opens to stop power to process equipment. An interface module can be added to allow the switch to accept a variety of periodic output signals. 21 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {10}
}