Loading ...
Home » Spaces » Smart-UPS & Symmetra LX / RM » discussion » General » Smart UPS AVR boost/trim thresholds.

Smart UPS AVR boost/trim thresholds.

Discussion in Smart-UPS & Symmetra LX / RM started by Vladimir , 6/2/2015 11:27 AM
Login to follow, share, and participate in this space.
Not a member?Join now
  • dstrr
    Vladimir
    Novice Novice
    Vladimir 6/2/2015 11:27 AM

    Hello.
    The question is - what is voltage levels thresholds for switch to AVR trim/boost and swithc back to live?
    Thank You.


     

  • JonPro
    Jonathan
    =S= Representative
    Jonathan 6/2/2015 11:56 AM (in response to Vladimir)

    Hello Vladimir -

    May I please know that model number of the UPS that you have? It can be found on the white barcode sticker attached on the back of your UPS.

  • dstrr
    Vladimir
    Novice Novice
    Vladimir 6/2/2015 12:08 PM (in response to Jonathan)

    This is the common question, based on suppose that AVR is boosting, for example, if input is "Rated Output Voltage"-5% and higher than "Low Transfer Voltage", and trimming if input is (Rated Output Voltage)+5% and lower than "High Transfer Voltage".

    I have number of different Smart UPS, from SURT10000 to SMT750.

    Thank You.

  • Jordan.Cabral
    Jordan
    Apprentice Apprentice
    Jordan 6/2/2015 1:58 PM (in response to Vladimir)

    Generally AVR has a +/- 12% range in the Smart UPS, unless your unit features double boost.  This is not true for the SURT series units as they are Online units rather than Line Interactive.

    -JC
  • dstrr
    Vladimir
    Novice Novice
    Vladimir 6/2/2015 4:32 PM (in response to Jordan)

    So, if the output voltage is set to 230 VAC, boost will be activated at point 230-12%(230)=202.4 VAC, trim will be activated at point 230+12%(230)=257.6.
    I suppose i misunderstood You.

     

  • dstrr
    Vladimir
    Novice Novice
    Vladimir 6/2/2015 5:47 PM (in response to Vladimir)

    Sorry my carelessness, from the build-in NMC help:

    High Transfer Voltage
    The upper limit of acceptable input voltage. When the input reaches this value, the UPS starts to use its AVR Trim feature.
    Low Transfer Voltage
    The lower limit of acceptable input voltage. When the input reaches this value, the UPS starts to use its AVR Boost feature or switches to battery operation if it does not have this feature.
     
    Okay, AVR boost/trim points may be specified obviously, how determine points of switching from AVR to battery.

    Thank You.

  • voidstar
    voidstar
    Expert Expert
    voidstar 6/3/2015 6:26 PM (in response to Vladimir)

    Amount of boost or trim depends on the UPS model, which is why Jonathan asked. Lets assume 12%. V_in = Line Voltage RMS; hyst = hysteresis; => means implication. Treatment of hysteresis is for example only and may be different on an actual UPS.

    V_in < Lower Transfer Point/(1+0.12)+hyst => UPS is on battery

    Lower Transfer Point/(1+0.12)-hyst < V_in < Lower Transfer Point+hyst => UPS in boost

    Lower Transfer Point-hyst < V_in < Upper Transfer Point+hyst => UPS normal

    Upper Transfer Point-hyst < V_in < Upper Transfer Point/(1-0.12)+hyst => UPS in trim

    Upper Transfer Point/(1-0.12)-hyst < V_in => UPS on battery

  • Page 1 of 1 (7 items)
Choose your language:  
powered by Communifire
Version 5.2.6420.11692