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APC 900 UPS fan going into high speed for no reason at all for long period of time

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    #21
    Re: APC 900 UPS fan going into high speed for no reason at all for long period of tim

    https://www.ebay.com/itm/Battery-Pro...4AAOSwUn9aBZAJ

    Here is a link to one that is very-very close to what I use I have look at how you select the number of cell because I can not remember what you have to do
    9 PC LCD Monitor
    6 LCD Flat Screen TV
    30 Desk Top Switching Power Supply
    10 Battery Charger Switching Power Supply for Power Tool
    6 18v Lithium Battery Power Boards for Tool Battery Packs
    1 XBox 360 Switching Power Supply and M Board
    25 Servo Drives 220/460 3 Phase
    6 De-soldering Station Switching Power Supply 1 Power Supply
    1 Dell Mother Board
    15 Computer Power Supply
    1 HP Printer Supply & Control Board * lighting finished it *


    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
    2 Hem Saw Computer Stack Board

    All of these had CAPs POOF
    All of the mosfet that are taken out by bad caps

    Comment


      #22
      Re: APC 900 UPS fan going into high speed for no reason at all for long period of tim

      Well some bad news on this battery backup it bit the big one

      We had a bad thunderstorm yesterday afternoon ( the power blinked on and off a bunch of times in a row ) and now it does not charge the batteries no more ( also the fan does not run either ) you can get the green to come on but if you turn on the power supply back on a couple of minutes later it goes into shutdown mode and the battery replace is flashing and there is no inverter function that is working

      To many issues with it this time around

      I am not going to try to repair it again I can not find any obvious damage but to me it not worth the time or the effort to try to fix it again
      Last edited by sam_sam_sam; 08-08-2020, 01:13 PM.
      9 PC LCD Monitor
      6 LCD Flat Screen TV
      30 Desk Top Switching Power Supply
      10 Battery Charger Switching Power Supply for Power Tool
      6 18v Lithium Battery Power Boards for Tool Battery Packs
      1 XBox 360 Switching Power Supply and M Board
      25 Servo Drives 220/460 3 Phase
      6 De-soldering Station Switching Power Supply 1 Power Supply
      1 Dell Mother Board
      15 Computer Power Supply
      1 HP Printer Supply & Control Board * lighting finished it *


      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
      2 Hem Saw Computer Stack Board

      All of these had CAPs POOF
      All of the mosfet that are taken out by bad caps

      Comment

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