Fan speed on Sparkle PSUs

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  • Maxxarcade
    Badcaps Veteran
    • Jul 2006
    • 973
    #1

    Fan speed on Sparkle PSUs

    I have two Sparkle FSP300-60PN supplies in my servers which I would like to increase the fan speed on. It is a single 120mm ball bearing fan, but the PSU is running warmer than I'd like, probably because the case fans are more powerful than the one in the PSU.

    Does anyone know off hand how the fan speed control works in these units? Is there just a thermistor that I can bypass instead of connecting the fan directly to 12v? I don't want to splice any 12V leads if I don't have to.
    Tags: None
    • shadow
      Badcaps Veteran
      • Feb 2007
      • 732
      • Australia
      #2
      Re: Fan speed on Sparkle PSUs

      I checked the model on newegg to confirm whether the power supply indeed varies the speed of the fan. I have found out that it does. There are several things you can do, you can somehow bypass the thermistor in it.

      A power supply that I threw out in the bin a year ago or so had some trimpots on it. I believed that they were used to manually control the speed of the fan (by varying the resistance). It also had a thermistor in it so I was not sure of the purpose of those trimpots. Possibly this may be the case with this power supply.

      Directly connecting it to the 12V lead you be alright as well. If I were to go down that route I would solder on a fan connector so that it will be easy to replace the fan if need be in the future.

        Comment

        • 999999999
          Badcaps Veteran
          • Sep 2006
          • 774
          • USA
          #3
          Re: Fan speed on Sparkle PSUs

          How much of a fan speed increase do you need? Some of the Sparkle PSU used fairly poor Yate Loon sleeve bearing fans that may not have such a great lifespan running at high RPM.

          Otherwise the fan might still run faster than you need it to at a full 12V, but it will at least be slightly under 12V so long as the fan control circuit is the power source. You could jumper across the thermistor but first you might see if you can get acceptible increase by putting a resistor in parallel with it instead, probably something in the few hundreds of ohms to under 10K, or of course a POT but then you have to have some place to mount it while the resistor could just be tacked & soldered down.

            Comment

            • dood
              Deputy dood
              • Mar 2004
              • 2462
              • USA
              #4
              Re: Fan speed on Sparkle PSUs

              I have to believe they're thermistor controlled. If I'm playing a graphics-intensive game such as FEAR, it will run at a normal speed for 5 minutes or so, and then speed up. After exiting the game, it will stay sped up for a little while, then spin back down.
              Ludicrous gibs!

                Comment

                • gonzo0815
                  Badcaps Legend
                  • Feb 2006
                  • 1600
                  #5
                  Re: Fan speed on Sparkle PSUs

                  Most FSP units i have opened have had a controller board screwed to the secondary heat sink and a thermistor glued on it.
                  i think you can easily bypass the thermistor with a pot for variable fan control or simply short it for max rpm.

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