Can the pump regulate speed off a 3-pin fan controller? I know the pump gets all its power from the molex.
Yes, I know the PWM is better.
Can the pump regulate speed off a 3-pin fan controller? I know the pump gets all its power from the molex.
Yes, I know the PWM is better.
Not through the little PWM connector.
If you had a pump controller capable of handling high loads, you can regulate via voltage control through the molex, but you don't get nearly the range as you do with PWM.
This chart shows that using voltage control, I could get down to about 40% PWM levels at 7.4V, but much lower voltage than that is where the pump starts having trouble starting.
Voltage control is also a bit more risky, too high(>13V) or too low(<8V) and the pump will simply fail to start. That means bad news if you bump a control knob without knowing beyond the limits. PWM on the other hand will always run no matter what setting.
Last edited by Martinm210; 06-06-2011 at 10:36 PM.
Thanks for this, Martin. This is a question I get a lot, and this will be a good reference.
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