DIY fan Question

[Matlock]

Reference; Noctua NF F12 3000 PWM 120mm x 25mm fan w/ NA-FC1 Control.

So Sternwake, I'm not remembering, is there another wire configuration for this fans control to access it's full 3k rpm? Seems like max speed is about 3-400 rpm with control full on. I read a reference that a wiring change would in essence eliminate the control and run a 3k constant but I don't want that. Any thoughts?

Note; haven't used this much as it does require a pencil to start the fan turning, otherwise it just sits there and cavitates or whatever the correct word is for that in electrical jargon.

The assembly isn't working in it's new space and I need the 120mm size. I've looked at the Silverstone 120mm but those advertise the same 110 cfm as the Noctua. Maybe it's my wiring?

[sternwake]

I've only powered that specific Noctua fan through the Noctua NA-fc1 speed controller as far as I can remember..

I assumed if one fed the +yellow and black- wires 12v directly, it would spin 3K rpm, 3 to 4 hundred is absolute minimum speed. I think if blue wire and black wire share the negative, then it spins at minimum possible rpm which it sounds like yours is doing.

I get that you already have this fan and likely got it on my recommendation. I apologize.

My first two failed and then their 2 warranty replacements failed each lasting about 6 months average, and now I run one 140mm 3k rpm IPPC Noctua, and I have a new 140 3k rpm in its box still unopened. The other 120mm slot is being taken up by a JAro 120mm x38mm (200 cfm) fan on a voltage bucker as a speed control.
Both 140's were free warranty replacements as I told them I do not trust their industrial Noctua nf-f12 after 4 failures where even the cheapest 120mm junkfan has lasted significantly longer in the same location.

https://www.amazon.com/Noctua-NA-FC1-4-p...B072M2HKSN.

This controller ^ is the easiest way to speed control a 4 wire PWM computer fan. I am not sure if it works on Delta fans, my new favorite, I have heard their PWM signal requirements are different than other fans. I've not yet tried it. The controller is rated for 3 amps.

Doing what I am doing with voltage based speed control on powerful computer fans, requires significantly more effort and skill to get functional.

If you don't care about finger twist speed control, but can bust out a jeweler's screwdriver to change speed, then voltage based speed control is pretty simple and inexpensive, the issue is desoldering the tiny trim pot, adding wires to a remote finger twist trim pot. Details and product links in thread below

https://vandwellerforum.com/thread-3137.html

[Matlock]

No apology please, I ventured into this because I was interested in an adjustable fan in a custom box. And more importantly it's probably my wiring. I'll get this thing opened up this week when I dig out my electric toy box and report what I see.

It's all about the process, the end result often, is what it is. That's why someone invented erasers for pencils and desolder suckers.