Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-12-17
1991-03-05
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340657, 318445, 417 63, G08B 2100
Patent
active
049980971
ABSTRACT:
A motor control having mechanical switching and pressure reponsive components for connecting and intercepting a circuit between an A.C. source and an A.C. motor in response to pressure changes in a pressure system. The control includes a microcomputer chip and components that detect a voltage across the motor and a current through the motor and provide signals indicative of the level of the motor voltage and current. The control in response to the signals determines the power factor of the current and in response to the detected signals protects the motor from operating malfunctions when the voltage is too high or low, the current is too high or too low, the time of operation of the motor is too long or too short and in response to the character of the malfunction provides a visual coded lamp indication of the cause of the malfunction.
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"A Power Factor Sensitive Relay Using Switching Transistors", by N. Bhaskara Rao, IE (I) Journal-ET, vol. 60, Dec., 1979, pp. 39-40.
Kierstead Bruce E.
Noth Myron A.
Femal Michael J.
Gilroy Hugh M.
Hofsass Jeffery A.
Orsino Joseph A.
Square D Company
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