Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1993-10-06
1996-04-16
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 94, H02H 300
Patent
active
055088759
ABSTRACT:
A self powered trip indicator remotely reads out parameters such as the type of trip detected in a contactor or motor starter circuit controllably coupling a power line to a load. The contactor circuit imposes signalling pulses on a trip status signal following a transition of the signal to a fault-indicating level, the pulses representing the parameters. The remote trip indicator derives operative power from the trip signal, and decodes the parameter from the pulses, using a decoder such as a counter to accumulate a binary multiple count of pulses, the result being indicated on LEDs coupled to outputs of the decoder. A switching circuit generates a short reset pulse to the counter at a leading transition following a pulse or level of a width exceeding a time limited by an RC combination coupled to the counter reset input. An RC timing circuit on the input side distinguishes the leading transition from other transitions by disabling a subsequent reset for a minimum time after generation of a first reset, during which time the pulses are counted and the result remains stable on the indicator LEDs. The circuit permits a reset after a longer duration between transitions, after which transitions defining shorter duration pulses represent a serial information signal.
REFERENCES:
patent: 4335413 (1982-06-01), Engel et al.
Westinghouse Electric Corporation, entitled "Advantage Control Modules: The Simplest Way To Control A Motor", dated Apr., 1993.
Westinghouse Electric Corporation, Instruction Manual, "Instructions for Advantage Control Modules Used with Full-Voltage Two-Speed Advantage Motor Starters and Contactors", dated Jun., 1993.
Eaton Corporation
Medley Sally C.
Moran Martin J.
Pellinen A. D.
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