stgislander (Customer) asked a question.

March 24, 2023 at 4:59 PM
PID gain in Do-more

The question was asked to me what is the unit for the Gain value in the PID controller. Obviously it is unitless. Based on the definition in the instruction help... "The Gain (P) value sets the output of the PID loop proportional to the change in the process variable (PV)."

 

That said, if the unit of my process variable (PV) was in for example percent (%), then is the "unit" of Gain %out / %in?

  • 2 answers
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  • ADC Community_02 (Automationdirect.com)

    The Proportional (P) term simply multiplies the difference between where you want to be and where you are right now and passes it to the output, i.e. the Error (difference between SP and PV).

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  • ADC Community_02 (Automationdirect.com)

    The Proportional (P) term simply multiplies the difference between where you want to be and where you are right now and passes it to the output, i.e. the Error (difference between SP and PV).

    Selected as Best

    • stgislander (Customer)

      Like I thought... thanks.

       

      I still think in volts/volt where an 'X' volt change at the feedback sensor ADC channel resulted in a 'Y' volt change at the the servo valve DAC channel. That is your 'P' loop gain.

 

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