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Method of operating a safety vacuum release system

  • US 8,602,743 B2
  • Filed: 01/13/2012
  • Issued: 12/10/2013
  • Est. Priority Date: 10/06/2008
  • Status: Active Grant
First Claim
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1. A method of operating a safety vacuum release system with a controller for a pump including a variable speed motor, the method comprising:

  • measuring an actual power consumption of the motor necessary to pump water and overcome losses;

    filtering the actual power consumption with a fast low-pass filter to obtain a current power consumption;

    incrementing an absolute counter value if at least one of the actual power consumption and the current power consumption is greater than a threshold power curve;

    identifying a dead head condition if the absolute counter value exceeds an absolute counter threshold value; and

    triggering the safety vacuum release system when the dead head condition is identified in order to shut down the pump substantially immediately.

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