Pump controller system and method
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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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.
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Citations
5 Claims
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1. A method of detecting a fault condition in a motor of a pump, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification