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US 7,612,510 B2Granted
Pump controller system and method
AssigneeSta-Rite Industries, Inc.
InventorRobert M. Koehl
Life of this patent
Estimating the term…
Abstract
A method and apparatus for a pump control system. One or more embodiments of the invention include a pump controller that can perform a self-calibrating procedure, can provide precise motor speed control, can provide a limp mode before shutting down the motor when system parameters are exceeded and/or fault conditions occur, can detect fault conditions, and can store fault conditions for later retrieval.
Claims4
A method of detecting a fault condition in a motor of a pump, the method comprising:
- sensing a first line current value;
- sensing a speed of the motor;
- attempting to operate the motor in a reverse direction if the first line current value is greater than a programmed threshold and if the speed of the motor is less than a motor speed low threshold;
- sensing a second line current value while the motor is operating in the reverse direction;
- generating a fault condition code and shutting down a drive to the motor if the second line current value is also greater than the programmed threshold;
- and operating the motor in the reverse direction for a time period if the second line current value is less than the programmed threshold and attempting to operate the motor in a forward direction after the time period has elapsed.
3 more elements
Dependencies are inferred from the claim text.