Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1983-04-20
1984-06-26
Smith,, Jr.
Electricity: motive power systems
Induction motor systems
Primary circuit control
361 33, 361 86, H02P 124
Patent
active
044568673
ABSTRACT:
A microprocessor control motor starter is utilized in which the microprocessor measures the status of AC input signals which are coupled thereto by way of an isolating electro-optical device. The electro-optical device provides a square wave output signal. Thirty-six samples are made to determine if the output signal is at a digital "1" level or a digital "0" level. If more than 18 digital "1's" are found, that is an indication that the device has failed and a trip operation is initiated by the microprocessor. If less than 18 but greater than some arbitrarily chosen small number such as 6 is found, that is an indication that the switch empowering the optoelectrical device is in a closed but valid disposition. If a number less than 6 is found, that is an indication that the switch is in the open disposition. If the device is failed, the microprocessor will trip the motor.
REFERENCES:
patent: 4286303 (1981-08-01), Genheines et al.
patent: 4291355 (1981-09-01), Dinger
patent: 4306265 (1981-12-01), Kuntner et al.
patent: 4409635 (1983-10-01), Kraus
Mallick, Jr. George T.
Maynard Pamela M.
Moran M. J.
Smith Jr.
Westinghouse Electric Corp.
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