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D5 Next Pumps - Fans only spin at 100%

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PumpNoob

Newbie

Posts: 4

D5 Next Pumps - Fans only spin at 100%

Saturday, May 15th 2021, 11:49pm

I have nine Noctua NF-A14 iPPC 2000 PWM fans rated at 2.16W max input each connected to a passive Splitty9 that is connected to my D5 Next pump. Using manual control, if I set the fan power to anything less than 100%, the fans will stop spinning. I tried a different pump, Splitty9, and fans to no avail.

According to the product page, the pumps are supposed to support "PWM fan output with up to 25 Watts of power and speed monitoring". 9 * 2.16 = 19.44W, which is less than 25W. Am I doing something wrong?

Thanks.

cptninc

Full Member

Posts: 198

Sunday, May 16th 2021, 3:53am

Do you have the fans assigned to a controller? How do you have the controller configured? How do you have the fans configured?

PumpNoob

Newbie

Posts: 4

Sunday, May 16th 2021, 6:17am

I'm not sure what you mean by "assigned to a controller". The fans are connected to a Splitty9 (passive) which is connected to my D5 Next pump.

cptninc

Full Member

Posts: 198

Sunday, May 16th 2021, 3:14pm

How do you have aquasuite configured?

aquasuitescreenshot.jpg

PumpNoob

Newbie

Posts: 4

Monday, May 17th 2021, 1:24am

Attached.
PumpNoob has attached the following image:
  • aquasuite.png

cptninc

Full Member

Posts: 198

Monday, May 17th 2021, 3:19am

I just remembered what the issue might be. Some Noctua fans are not compliant to the Intel PWM spec and thus don't work great with controllers that follow that spec - such as the one on the D5 Next.

At least, that's my recollection of the subject. Wouldn't be the first time I've been wrong and won't be the last.

Remayz

Senior Member

Posts: 708

Monday, May 17th 2021, 11:46am

i red that often but even on their own spec there's no difference between regular or industrial 12V fans (only a slight diff on the 24V fans tach output)

https://noctua.at/pub/media/wysiwyg/Noct…white_paper.pdf

cptninc

Full Member

Posts: 198

Monday, May 17th 2021, 1:54pm

There was a user here a couple of years ago who ran into this with his Noctuas. He reached out to them and they eventually confirmed the issue and sent him new fans that did work. They made a change in their controllers and the fans manufactured before that split work just fine. That split was a date split and not a model split, so the same SKU can both work and not work depending on its date of manufacture.


https://hardforum.com/threads/noctua-vio…onfigs.1994702/

Splitty 9 active PWM problem

This post has been edited 2 times, last edit by "cptninc" (May 17th 2021, 3:17pm)

Remayz

Senior Member

Posts: 708

Monday, May 17th 2021, 8:07pm

Interestiiiing... that may explain why some vardar fans were reported to be not working and yet i had no issues with the new X3M.. same for the Noctuas industrial.. thanks for the insights

PumpNoob

Newbie

Posts: 4

Wednesday, May 19th 2021, 2:44am

Quoted from "cptninc"

There was a user here a couple of years ago who ran into this with his Noctuas. He reached out to them and they eventually confirmed the issue and sent him new fans that did work. They made a change in their controllers and the fans manufactured before that split work just fine. That split was a date split and not a model split, so the same SKU can both work and not work depending on its date of manufacture.


https://hardforum.com/threads/noctua-vio…onfigs.1994702/

Splitty 9 active PWM problem
Thanks, not sure how I missed that in my search.. Will reach out to Noctua.

Shoggy

Sven - Admin

Posts: 18,130

Wednesday, May 19th 2021, 9:47am

This is a well known problem with older fans from the iPPC series. There is also a note about it on Noctuas website:
https://noctua.at/en/are-noctua-fans-com…fan-controllers

You can ignore that it only mentions the aquaero. It also affects other controllers.

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