Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1979-03-19
1981-08-25
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 31, 361103, 318798, H02H 7085
Patent
active
042863031
ABSTRACT:
This disclosure relates to apparatus and method for controlling and protecting an electric motor. A transmitter is coupled to the motor and to the power lines for generating pulses on the power lines in certain circumstances such as during an overheated motor condition. A control unit is coupled to the power lines and senses the pulses and monitors the power current magnitude in the lines. The unit compares the current level with previously established upper and lower limits. If the current level is outside the limits for a preset length of time, a fault condition exists and the motor is turned off for a length of time that depends upon the severity of the fault. The unit also turns off the motor upon the receipt of pulses from the transmitter when a certain number of pulses regularly recur. The unit includes indicators for displaying the nature of the fault. The unit may be adjusted for automatic operation wherein it will turn the motor on again after a time interval, or for manual operation wherein the motor can only be restarted manually.
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Genheimer Stephen R.
Reinhard Linda M.
Whitney John A.
Franklin Electric Co. Inc.
Salce Patrick R.
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