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The speed of D5 pump is NOT controlled by voltage.

post #1 of 14
Thread Starter 
Most ppl say the speed of D5 is controlled by voltage since they're able to change the speed via fan controller(20W/channel up).

But today I'll give you a counter-example that shows voltage doesn't change the RPM.

As we know the operating voltage range of D5 is from 6V to 24V.
See the pic below, Under any of the voltages (8V, 12V and 24V), P1 runs 1800rpm, P2 is at 2550rpm, P3 at 3300rpm, P4 at 4050rppm and P5 at 4800rpm.

So, conclusion is as title said.


biggrin.gif:D:D:D:D:D:D:D:D:D:D:D:D:D:D:D:D:D:D:D



attachment.php?attachmentid=209680&stc=1&d=1304957313

attachment.php?attachmentid=209681&stc=1&d=1304957313

attachment.php?attachmentid=209682&stc=1&d=1304957313
post #2 of 14
But if you look at each graph,

The first goes up to 800L/PH

The second goes up to 1000L/PH

The third goes up to 1200L/PH

Therefore, there is a difference of L/PH on the 8v, 12v and 24v graphs.

So it is controlled by voltage. Sorry
post #3 of 14
Did you even read those 3 graphs or just look at the legend on the right? It's pretty clear they are displaying different ranges and that it is in fact controlled by voltage...
 
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post #4 of 14
Im gonna go with the others and say it does change it.

If it does not can you please explain what does? Because if the voltage is the only thing changed between each graph, then the voltage does control it.
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post #5 of 14
It looks like each of the P-states show what RPM it might be, not actual RPM.
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post #6 of 14
Here is some test data, although I didn't include undervolting as a test:
http://martinsliquidlab.org/2011/04/03/koolance-pmp-450-d5-vario-pump/

I can confirm there is no practical gain from 12 to 24v with the vario, the strong on the other hand does change A LOT!

I also know that speed varies depending on restriction on many pumps.

I can't rember for sure, but I thought you can reduce speed by undervolting.

I'll check and let you know..
koolancepmp450s-comp3.png
Edited by Martinm210 - 5/9/11 at 1:07pm
    
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post #7 of 14
Which D5?.there are three flavors....biggrin.gif
    
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post #8 of 14
Why don't you just open one up and check for a PWM IC?
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post #9 of 14
Martin what do u thik about this pump??

http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_201&products_id=30626


Is this a nice pump..i search for some details but looks new..
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post #10 of 14
Quote:
Originally Posted by Havoknova;13443317 
Martin what do u thik about this pump??

http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_201&products_id=30626


Is this a nice pump..i search for some details but looks new..

Looks like a D5 vario with aftermarket top...good pump, but no experience with the top. Generally the D5 tops are more for looks and barb compatibility than adding performance.

Of the Varios, I like the Koolance offering best because of the included RPM wire feature, but they all perform the same.
    
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