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Apparatus and method for calibrating a motor monitor by reading and storing a desired value of the power factor

  • US 4,864,287 A
  • Filed: 10/01/1986
  • Issued: 09/05/1989
  • Est. Priority Date: 07/11/1983
  • Status: Expired due to Fees
First Claim
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1. In an improved electric motor monitor, the monitor capable of connection to a supply of electrical energy for the motor, having;

  • a microcomputer for measuring the power factor of a voltage applied to said motor and a current flowing to said motor, for storing a desired value of power factor, for comparing a measured value of power factor with said desired value of power factor, and for disconnecting said motor from said supply of electrical energy if said measured value of said power factor differs from said desired value of power factor by an amount that exceeds a predetermined amount,the improvement comprising;

    means for operating said motor while driving a desired load;

    means for commanding said microcomputer to measure a power factor of said voltage applied to said motor and said current flowing to said motor while said motor is driving said desired load; and

    ,means for storing said measured value of said power factor, measured while said motor is driving said desired load, as said desired power factor.

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