Need help with IGBT 1450va ups/inverter

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  • sarry86
    Senior Member
    • Jun 2021
    • 90
    • Tanzania
    #1

    Need help with IGBT 1450va ups/inverter

    Hello everyone, I have this ups/inverter IGBT 1450VA which was working great until it started showing short circuit on a small lcd screen, I opened it up and started troubleshooting it and indeed I found some fault transistors, I decided to get rid of all of the transistors next to the shorted ones and it worked for some minutes without a problem, but then I heard a relay tripping off, and now it is showing that 2 batteries connected in series have no power at all, and if i disconnect the 24dc in then the battery are showing they are full (28vdc) with another inverter, they are working great no problem, I started to troubleshoot it again starting with the parts I replaced, they are okay, checked other included igbt (GW30NC120HD and G4PH40UD2) they're all fine, I am outta ideas, what else could be the problem here?
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    • sarry86
      Senior Member
      • Jun 2021
      • 90
      • Tanzania
      #2
      Re: Need help with IGBT 1450va ups/inverter

      And this is exactly the picture of the actual device
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        • KYBOSH
          Badcaps Veteran
          • Oct 2011
          • 581
          • Unknown
          #3
          Re: Need help with IGBT 1450va ups/inverter

          The batteries .... how strong are they really?
          They may read good voltage but their capacity is diminished.
          If you can test your UPS/inverter with fresh high quality batteries to eliminate this as a source of the problem.

          Good luck!

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