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Pump speed

post #1 of 15
Thread Starter 
Pump speeds should always be run at full speed directly connected to the PSU, right? No reason to undervolt it except for those noisy AIO pumps?
post #2 of 15
The vast majority of what I have read is that this approach is not a necessity. Indeed, if it was correct, why would there be a D5 vario, or MCP-35x?
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post #3 of 15
not 100% sure on small dc motors but larger motors dont care up to a certain point. As long as the motor is going fast enough to cool itself and isnt pulling too many amps it shouldnt care the least bit that it is getting less voltage input, it might have an internal regulator that cuts it off when the voltage gets too low....
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post #4 of 15
Thread Starter 
Quote:
Originally Posted by Capt Proton View Post

The vast majority of what I have read is that this approach is not a necessity. Indeed, if it was correct, why would there be a D5 vario, or MCP-35x?

Quote:
Originally Posted by fogran View Post

not 100% sure on small dc motors but larger motors dont care up to a certain point. As long as the motor is going fast enough to cool itself and isnt pulling too many amps it shouldnt care the least bit that it is getting less voltage input, it might have an internal regulator that cuts it off when the voltage gets too low....

Oh ok. So you mean it will operate the same for a range of input voltage? Let's say 6-12V have the same effect?
post #5 of 15
Quote:
Originally Posted by kevindd992002 View Post


Oh ok. So you mean it will operate the same for a range of input voltage? Let's say 6-12V have the same effect?

Not what I said. Of course, with less voltage it will create less flow. The idea is that full flow is not required all of the time, so you slow down the pump. Less heat dump, less noise etc.
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post #6 of 15
Better cooling with more mass flow; therefore, pump that pump up!
post #7 of 15
Thread Starter 
Quote:
Originally Posted by Capt Proton View Post

Not what I said. Of course, with less voltage it will create less flow. The idea is that full flow is not required all of the time, so you slow down the pump. Less heat dump, less noise etc.

Ah ok. But why would you want less heat dump? Or are you saying that as a disadvantage of slowing down the pump?
post #8 of 15
With a non-PWM pump, undervolting actually creates more heat because as you reduce voltage, amperage must increase since the resistance is constant. That's why the D5 has that variable control to change resistance, allowing 12v input to run the pump at lower speeds without needing more amperage.

In the case of a D5, most people run them at setting 3 or 4, but it depends on how restrictive your loop is. Your target flow rate is at or a little over 1 gpm.

A PWM pump, which is available in both D5 and DDC variants, allows you to dynamic control pump speed without wasted electricity.
post #9 of 15
Quote:
Originally Posted by kevindd992002 View Post

Ah ok. But why would you want less heat dump? Or are you saying that as a disadvantage of slowing down the pump?

That is exactly what I am saying. Pumps with non PWM speed control create heat, but where the heat is dumped may be controlled.
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post #10 of 15
Other then for noise, I see little benefit at running your pump at less then full speed. Of course it's nice to be able to slow down the pump to fill up.
If your pump comes with speed control, turn that puppy all the way up and dial it down until the noise it tolerable to you. Also make sure to properly decouple the pump first.
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