Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-10-01
1989-09-05
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340657, 318445, 361 79, 417 63, G08B 2100
Patent
active
048642878
ABSTRACT:
A monitor for an electric motor, the monitor capable of connection to a supply of electrical energy for the motor, has a microcomputer for measuring the power factor of a voltage applied to the motor and a current flowing to the motor, for storing a desired value of power factor, for comparing a measured value of power factor with the desired value of power factor, and for disconnecting the motor from the supply of electrical energy if the measured value of the power factor differs from the desired value of power factor by an amount that exceeds a predetermined amount. Further, the monitor has means for operating the motor while driving a desired load; means for commanding the microcomputer to measure a power factor of the voltage applied to the motor and the current flowing to the motor while the motor is driving the desired load; and, means for storing the measured value of the power factor, measured while the motor is driving the desired load, as the desired power factor. The monitor may control a motor driving a pump for a fluid system. The monitor may include: a pressure sensitive mechanical switch; means for measuring motor current, voltage applied to the motor, time intervals during which the motor is energized, and the rapidity of cycle time of the motor in order to disconnect the motor from the source of electrical energy to prevent damage to the motor.
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Guttman Richard T.
Hofsass Jeffery A.
Johnston A. Sidney
Orsino Joseph A.
Square D Company
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