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    R 438 A.V.R.: R 438 For Shunt, Arep or PMG Alternators

    Uploaded by

    Anas Basarah
    R 438 is an analog AVR that controls excitation current to maintain the output voltage of alternators with AREP or PMG excitation. It regulates voltage within ±0.5% and has options for U/F and LAM functions. Settings are made through potentiometers for functions like droop, voltage, and stability.

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    R 438 A.V.R.: R 438 For Shunt, Arep or PMG Alternators

    Uploaded by

    Anas Basarah
    7 views2 pages
    R 438 is an analog AVR that controls excitation current to maintain the output voltage of alternators with AREP or PMG excitation. It regulates voltage within ±0.5% and has options for U/F and LAM functions. Settings are made through potentiometers for functions like droop, voltage, and stability.

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    4549_en

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    R 438 is an analog AVR that controls excitation current to maintain the output voltage of alternators with AREP or PMG excitation. It regulates voltage within ±0.5% and has options for U/F and LAM functions. Settings are made through potentiometers for functions like droop, voltage, and stability.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    7 views2 pages

    R 438 A.V.R.: R 438 For Shunt, Arep or PMG Alternators

    Uploaded by

    Anas Basarah
    R 438 is an analog AVR that controls excitation current to maintain the output voltage of alternators with AREP or PMG excitation. It regulates voltage within ±0.5% and has options for U/F and LAM functions. Settings are made through potentiometers for functions like droop, voltage, and stability.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    R 438 A.V.R.

    R 438 FOR SHUNT, AREP or PMG ALTERNATORS

    1 - Description

    R 438 is an analog A.V.R.


    It is designed for alternators with a
    AREP or PMG excitation.
    R 438 controls the excitation current in order
    to maintain the output voltage of the alternator.
    R 438 is performant in terms of voltage
    regulation, simple to set , to use and is reliable.
    It can run without LAM (U/f), or with LAM, selection
    is done by strap ST5.

    It is in compliance with I.E.C. 60034-1 standard


    and U.L. 508 / C.S.A. approved

    2 - Operation range
    LSA 40 42.3 44.3 46.3 47.2 49.3 50.2 51.2 53.1 54

    Shunt - - - - - - - - - -

    AREP - - - - - - - - - -

    PMG - - - - - - - - - -

    Operation mode : Standalone

    3 - Main feature and characteristics


    Voltage
    - Voltage regulation : ± 0.5 %. 60 Hz
    Knee 57 Hz

    - U/F function (1).


    Knee
    - LAM function (2). 48 Hz
    - Response time : 500 ms. 100 %
    U/UN 50 Hz
    - Nominal excitation current : 5A.
    - Maximum excitation current : 8A during 10 s.
    - Supply range and voltage détection : Frequency
    95 to 520 V. 50 Hz 60 Hz Hz

    - Protection : fuse 8A. (1) U/F function

    Transient voltage drop


    UN Max. speed drop with
    LAM
    fN LAM
    the shaft (kW)

    0,9
    Load on

    (U/f) 0,9 Variation in the load


    without LAM without
    0,8 with LAM LAM Load shedding due to LAM
    Time 0,8 Time Time

    0 1s 2s 3s 0 1s 2s 3s
    0 1s 2s 3s
    (2) LAM Function

    Ref : 4549en-2015.11/d Page 1


    R 438 A.V.R.

    4 - Opération conditions
    - Operating temperature range : - 40° C à + 70° C.
    - Storage temperature range : - 55° C à + 85° C.
    - Hygrometry : 98%.
    - Maximum choc : 9 g on 3 axis.
    - Vibrations : less than 10 Hz , 2 mm peak magnitude.
    From 10 Hz to 100 Hz : 100 mm/s, below 100 Hz : 8g.

    Optional modules compatible


    - R 731 : three phase voltage sensing.
    - R 734 : 3-phase current and voltage sensing for parallel operation.
    - R 726 : regulation system changed to “4 - function”.

    5 - Connexion and setting


    Settings are done through the A.V.R.

    - Potentiometer P1 : Quadrature droop setting.


    - Potentiometer P2 : Voltage setting.
    - Potentiometer P3 : Stability setting.
    - Potentiometer P5 : Excitation ceiling setting.

    140 mm

    X2 Z1 X1 Z2 E+ E- 0V 110 220 380 4 x holes Ø 5.8 x


    Slow fuse
    F1
    125 mm

    250V 8 A 115 x 100 mm

    ST5
    Quad
    with LAM without LAM
    P1 droop

    ST3 AREP
    Frequency 50Hz 60Hz ST9 PMG

    R 438
    ST10 T.I. S2 P2
    LAM 13 % 25 %
    Option
    Ph.1
    S1
    P1
    Excitation
    P5 ceiling
    ST4 Option
    open
    ST11 knee-point: 65 Hz
    External potentiometer
    for adjusting the voltage

    normal
    ST2 Response
    time fast ST1 P2 Option

    Single- R731 3-ph. detection


    P3 Stability phase
    detection Voltage in 3-ph. detection ST1 open

    Ref : 4549en-2015.11/d Page 2

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