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Cooling PWM Rheobus with D4 pump?

Discussion in 'Hardware' started by FeRaL, 1 Dec 2007.

  1. FeRaL

    FeRaL What's a Dremel?

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    I have a question. I have an old PC Mods Rheobus that uses pulse width modulation to control speeds. Would it be OK to use it with my DD-D4 pump to control the speed of the pump? Would it cause caitation or premature pump wear?
     
  2. Marci

    Marci Ex-O-CuK / ThermoChill

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    Don't think it'll work... doesn't PWM need RPM Pulse (which D4 / D5 pumps don't have)?
    It'd work with a DDC series pump... as long as your rheostat had enough wattage per channel to run it.
     
  3. Hazza

    Hazza What's a Dremel?

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    Hmm, I'm not sure to be honest. I wouldn't have thought it was particularly good for the pump, and it may not start up on PWM, you'd probably have to start it up on full voltage. AFAIK, people normally control pumps by just changing the voltage, not PWM.

    EDIT: The more I think about it, the surer I am that using PWM is not a good idea. Pumps use a large amount of current when they start up, and with PWM you're almost going to be doing this on every pulse. It won't quite be as bad because I'm sure the impeller will still have some momentum, but it will be inefficient. Also, you're going to be switching a large amount of current (maybe 2.5A?) very fast. Whilst this might not cause any problems with your power supply, I wouldn't reccommend it.
     
    Last edited: 6 Dec 2007
  4. FeRaL

    FeRaL What's a Dremel?

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    Thanks for the replies.
     
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