tstover wrote:
I How many do I really need? Where would I connected them if I had them? Can I disable this check and just put any old fans in there to keep it cool? Thoughts?
My thought is you are entering brave new territory here. Sorry. I don't think you can put any old fans in there.
as the GOBI, recondas wrote:
You could disable environmental monitoring, but I wouldn't recommend it.
Seconded.
tstover wrote:
So other than a different pinout, "regular" 3 wire pc fans can be used? I'll give this a try later. How did you figure out which pin is what? I suppose 2 of the 3 will be the DC power so it's probably not that hard to get it wrong. Now to dumpster dive for 6 fans...
I am not an expert here but the Fuel is a workstation of the same era as your Origin 300s are as servers. I suspect that the way things work is that the power supplies of machines of that era (Fuel, Tezro, Origin/Onyx 3xx) have circuits leading back to the power supply and the L1 monitoring. It senses the load or rpm with pwm(*) and the designers knew that load X meant an rpm of Y on the fan. If you found fans with the same electronic characteristics as those NMB Minebea 3110KL-04W-B79 present in the Origin 300s and they fit, you are in business. In the nekochan wiki article on Fuel PSU repair (
here ).
In the wiki it is wrote:
Pin 12: This is FANC, it should control fan speed. Read more below
Pin 24 This is FANM, it monitors fan speed. Connect to tachyometer pin on fan:
....
The FANC on pin 12 doesn't appear to work as expected. I expected that the wire would go directly to the fan header inside the PSU, but it looks like its going into one of the IC's, but I'm not sure. The FANC line stays put at +3.3V even when the system if powered down. This might be to low to start the fan from the PSU. Which might indicate that it is just a signal wire to a fan controller in the PSU.. but I don't know.. perhaps a good reason to get my oscilloscope out.
The fuel is merely from the same era. It may not work that way. But I hope I give you the courage to investigate and document.
People here in the past have replaced fans in Octanes and the like merely because they are too loud.
This is an opportunity to learn something about Origin 3(x)0 fans and power supplies and share it as wiki article.
Good luck,
R.
* How? I don't know, resistance? pulse width modulation on something that rotates with the fan? I am just guessing here.
Here is an article on mode sense:
http://www.e-gizmo.com/ARTICLES/Sense/MAKESENS.HTM_________________
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Anyway, on console power up (see below) I am informed that 3 fans are failing and so the system shuts down. A look inside (see picture) shows missing fans. Same story on both nodes. How many do I really need? Where would I connected them if I had them? Can I disable this check and just put any old fans in there to keep it cool? Thoughts? 
