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    Nakakita Temp Controller

    Uploaded by

    DwightFerrer
    This document provides an overview of a 120 minute training session on PID controller theory and practical demonstrations. It will cover open and closed loop systems, PID control terminology, valve positioners, actuator workings, adjustments and tuning. Specific topics that will be covered include proportional, integral and derivative control modes individually and combined. Diagrams are provided to illustrate the proportional, integral and derivative actions over time for different input types. The document also includes information about a pressure control setup using a restrictor, nozzle and flapper arrangement and diagrams showing the relationship between measured and desired values in the control loop. Maintenance considerations are listed at the end.

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    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd

    Nakakita Temp Controller

    Uploaded by

    DwightFerrer
    4K views13 pages
    This document provides an overview of a 120 minute training session on PID controller theory and practical demonstrations. It will cover open and closed loop systems, PID control terminology, valve positioners, actuator workings, adjustments and tuning. Specific topics that will be covered include proportional, integral and derivative control modes individually and combined. Diagrams are provided to illustrate the proportional, integral and derivative actions over time for different input types. The document also includes information about a pressure control setup using a restrictor, nozzle and flapper arrangement and diagrams showing the relationship between measured and desired values in the control loop. Maintenance considerations are listed at the end.

    Original Description:

    Nakakita Temperature controller operation

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    This document provides an overview of a 120 minute training session on PID controller theory and practical demonstrations. It will cover open and closed loop systems, PID control terminology, valve positioners, actuator workings, adjustments and tuning. Specific topics that will be covered include proportional, integral and derivative control modes individually and combined. Diagrams are provided to illustrate the proportional, integral and derivative actions over time for different input types. The document also includes information about a pressure control setup using a restrictor, nozzle and flapper arrangement and diagrams showing the relationship between measured and desired values in the control loop. Maintenance considerations are listed at the end.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    4K views13 pages

    Nakakita Temp Controller

    Uploaded by

    DwightFerrer
    This document provides an overview of a 120 minute training session on PID controller theory and practical demonstrations. It will cover open and closed loop systems, PID control terminology, valve positioners, actuator workings, adjustments and tuning. Specific topics that will be covered include proportional, integral and derivative control modes individually and combined. Diagrams are provided to illustrate the proportional, integral and derivative actions over time for different input types. The document also includes information about a pressure control setup using a restrictor, nozzle and flapper arrangement and diagrams showing the relationship between measured and desired values in the control loop. Maintenance considerations are listed at the end.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
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    The key takeaways from the document are the different types of controllers like proportional, integral, derivative and PID controllers and their working along with the maintenance required for a pressure controller.

    The different types of controllers discussed are proportional, integral, derivative, PID, step, on-off and sequential controllers.

    The components of a PID controller are the proportional, integral and derivative terms which are represented by Kp, Ki and Kd respectively along with the set point, process variable, error, comparator and controller output.

    C/E Mahesh Patil

    Elstan Fernandez
    Revise Terminology
    Understanding P I D controller theory
    Valve Positioner and Actuator working
    Adjustments and system tuning
    Practical / Demonstration

    Total duration 120 minutes


    Open Loop system
    Closed Loop System
    Measured value (mv)
    Actual value (av)
    Error (mv - av)
    Desired Value (dv)
    Comparator
    Deviation (mv - dv)
    Offset(Droop)(mv dv)
    Dead Band
    Proportional band
    Settling Time
    Set Point
    STEP CONTROL
    ON OFF CONTROL

    SEQUENCIAL CONTROL
    PROPORTIONAL CONTROL
    P + DERIVATIVE CONTROL
    P + INTEGRAL CONTROL
    P + I + D CONTROL
    Proportional

    Set Point Error Controller Output


    - KP + t
    e(t)
    Kpe(t) + Ki e(t)t + Kd
    t
    Integral 0

    Process
    Variable Ki +

    Derivative

    d
    Kd t

    PROPORTIONAL - (m)controller o/p is proportional to deviation { e(t)}

    m = - Kp * e(t)

    INTEGRAL - Rate of change of (m)controller o/p is proportional to deviation { e(t)}

    dm / dt = Ki * e(t)

    i.e m = - Ki e(t) * dt

    DERIVATIVE - (m)Controller o/p is proportional to rate of change of deviation { e(t)}

    m = - Kd * de(t) / dt
    Initial
    Condition
    Step Input Final Condition

    Process
    Time

    P Control
    Proportional Action

    Desired value
    Time
    Offset
    I Control
    Proportional + Integral Action

    Desired value
    D Control Time

    Proportional + Integral + Derivative Action

    Desired value
    Time
    Restrictor
    Nozzle Flapper arrangement
    Nozzle
    uncovered 3 Psi
    Acts as a transducer or an signal amplifier

    Supply Air Pr 1.5 bar


    Pressure Gauge
    Control air output pr range 3 ~ 15 psi
    Nozzle
    In mid position
    9 Psi Flapper Movement(X1, X2) approx 20
    microns
    Flapper

    Orifice Dia 0.25 mm


    Nozzle
    covered Nozzle Dia 0.40 mm
    15 Psi
    Output signal to Actuator

    Measured Value Desired Value

    (Reset Time) (Rate adjustment)


    Periodic calibration and cleaning of measuring devices/sensors (e.g. RTD probe in the FO purifier heater line, M/E
    JCW line etc.)

    Replacement of polyurethane tubes inside the controller every 24 months, as tubes tend to damage due to heat, oil
    and vibration.

    Quarterly cleaning of nozzle with a thin SS wire (<0.25 mm)

    Weekly cleaning of orifice by depressing the push button.

    Bellows and linkages must be checked for their intactness.

    Watch out for signs of air leakages inside the controller box

    Leakages in signal transmission lines from controller to regulating valve.

    Valve condition and integrity of valve packing/seals, moving surface of valve spindles.

    And most important, cleanliness of supply air. Correct working of filters and Pressure reducers settings.
    THANK YOU

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