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Pump controller system and method

  • US 20080131295A1
  • Filed: 10/31/2007
  • Published: 06/05/2008
  • Est. Priority Date: 12/08/2003
  • Status: Active Grant
First Claim
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1. A method of detecting a fault condition in a motor of a pump, the method comprising:

  • sensing a first bus current value;

    sensing a speed of the motor;

    incrementing a counter and setting a timer if the first bus current value is greater than a bus current upper limit and if the speed of the motor is greater than or equal to a high speed limit;

    attempting to operate the motor in a reverse direction if the counter has been incremented above an increment limit within a first time period;

    sensing a second bus current value while the motor is operating in the reverse direction;

    operating the motor in the reverse direction for a second time period if the second bus current value is less than the bus current upper limit and attempting to operate the motor in a forward direction once the second time period has elapsed; and

    generating a fault condition code and shutting down a drive to the motor if the second bus current value is greater than the bus current upper limit.

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