Pump controller system and method
AssigneeSta-Rite Industries, Inc.
InventorRobert M. Koehl
Life of this patent
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Abstract
Embodiments of the invention provide a method of detecting a fault condition in a motor of a pump. The method includes sensing a first current value and a speed of the motor, attempting a recovery operation if the first current value is greater than a current threshold and if the speed of the motor is less than a motor speed low threshold, and sensing a second current value during the recovery operation and shutting down a drive to the motor if the second current value is also greater than the current threshold. The method also includes performing the recovery operation for a time period if the second current value is less than the current threshold and attempting to operate the motor in a normal mode after the time period has elapsed.
Claims4
A method of detecting a fault condition in a motor of a pump, the method comprising:
- sensing a first current value;
- sensing a speed of the motor;
- attempting a recovery operation if the first current value is greater than a current threshold and if the speed of the motor is less than a speed threshold;
- sensing a second current value during the recovery operation;
- shutting down a drive to the motor if the second current value is also greater than the current threshold;
- and
- performing the recovery operation for a time period if the second current value is less than the current threshold and attempting to operate the motor in a normal mode after the time period has elapsed.
Dependencies are inferred from the claim text.