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Compressor protection and grid fault detection device

  • US 10,418,800 B2
  • Filed: 04/09/2018
  • Issued: 09/17/2019
  • Est. Priority Date: 02/20/2008
  • Status: Active Grant
First Claim
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1. A method for monitoring a compressor that is powered by an electrical grid, the method comprising:

  • measuring a power factor of a motor of the compressor;

    selectively detecting an occurrence of a fault event of the electrical grid based on the power factor;

    in response to detecting that the fault event has occurred, switching the compressor from a first state to a second state, wherein the compressor consumes less power in the second state than in the first state;

    identifying an apparent conclusion of the fault event; and

    in response to the apparent conclusion of the fault event, waiting for a first delay period before switching the compressor back to the first state.

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