Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1993-02-25
1995-11-28
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 96, 25022722, H02H 3093
Patent
active
054713595
ABSTRACT:
A solid state sensing and control device for monitoring either D.C. or A.C. currents of one or more phases that is ideal for protecting motors and other A.C. loads. The programmable monitoring device can detect an overload or an emergency and virtually instantaneously interrupt motor current to prevent burnout and reduce the danger of fire. High current conductors leading to the motor (or other load) are mechanically routed through current sensing coils. An LCD visible through the cabinet top displays menu information and data. Programming and command control are initiated by pressing one or more of a plurality of light buttons disposed beneath the cabinet that comprise OPIC transmitter-receiver pairs. An instrumentation amplifier is associated with each sensing coil, and the circuitry preferably outputs two amplified analog signals from each coil, the amplitude of the first being proportionately higher than the second. Preferably the CPU switches between the latter signals to automatically select a proper range. The CPU activates a relay field to activate a control relay that in turn activates remote relays associated with the load to be controlled. The relays disconnect current to the load when an error condition or an overload is measured.
REFERENCES:
patent: 3937952 (1976-02-01), Ripley et al.
patent: 4338647 (1982-07-01), Wilson et al.
patent: 4814600 (1989-03-01), Bergstrom
patent: 5166887 (1992-11-01), Farrington et al.
patent: 5224011 (1993-06-01), Yalla et al.
patent: 5255148 (1993-10-01), Yeh
patent: 5270898 (1993-12-01), Elms et al.
IBM Technical Disclosure Bulletin, Transparent Keyless Keyboard for Variable Terminal Applications vol. 20, No. 4 (Sep. 1977, 1609-11).
Picado Sergio
Simpson Elmer J.
Carver Stephen D.
DeBoer Todd
Impco Inc.
Keisling Trent C.
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