19-09-2013 дата публикации
Номер: US20130242439A1
Принадлежит:
In the field of motor protection for industrial automation systems, HVAC systems, pumping systems, and/or similar implementations, improved motor starters and overload electronics can be configured to offer substantially automatic levels of protection for motors, independent of such starters and/or overload electronics first being calibrated for, or properly calibrated for, the motor. 1. A motor protection system , comprising:an overload circuit including a current sensor for sensing current supplied to a motor having a specified full load amperage value;a contactor provisioned for selectively supplying power to the motor; anda microprocessor-based control board, wherein the control board includes executable instructions for comparing one or more characteristics of current sensed by the current sensor to one or more corresponding characteristics expected for the motor, the expected characteristics being indicative of a normal operating condition for the motor, and, in response to an unfavorable comparison, indicating a fault condition.2. The system of claim 1 , wherein the executable instructions further instruct the overload circuit to trip.3. The system of claim 2 , wherein claim 2 , in response to the trip claim 2 , the contactor discontinues the supply of power to the motor.4. A method for protecting a motor claim 2 , comprising the steps of:measuring peak inrush current to a motor;measuring running current to the motor over time;comparing the peak inrush current and the running current to an indicated full-load-amperage value; andin response to a unfavorable comparison, initiating a protective action for the motor.5. The method of claim 4 , wherein the protective action includes sending a trip signal.6. The method of claim 4 , wherein the protective action includes annunciating a fault condition. This application is a nonprovisional of, and claims the benefit of priority from, U.S. Provisional Patent Application No. 61/531,610, filed Sep. 6, 2011, which is ...
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