Bitcoin Forum

Hello,

how are the s9 fans supposed to work?
If there is 100% fan speed is the "front" fan (sucking out the air) supposed to run at 6000+rpm and the back fan(under the ethernet port, pushing the air inside) at around 4000rpm? Or the opposite way?
I think the fans are wrong plugged in my case, btw. its the 13.5 TH/s model.

Greetings

As I understand it the push fan should be the higher rpm fan, so it seems reversed.  Others have complained of this lack of QC...  :P

Yours are reversed. The fans should be pulling air in from the ethernet side at 6000 rpm and the exhaust fan should run slower.

Okay thanks a lot, i will change both fan connections.

Not the connections, you need to move the fans themselves.

If the out sucking fan is now set to 6000 and the in pumping one on 4000 and i just change both cable/connection ... the software will adress the right fans. 6000 to pump in and 4000 to suck out. Or do i think in the wrong direction?

All you should have to do is switch the plugs.

Bitmain only uses a single fan spec, its the software the underdrives one of them.

Where are the temp sensors and what would happen if the Ethernet side and power side were reversed flow?

In my miners the fan on the opposite side of the Eth port is often running faster. I guess it's to create negative pressure inside.

How can you tell which fan is spinning quicker?

I am concerned that my fans may be hooked up incorrectly.

if I face the S9 from the air intake side (so the controller board is farthest away from me) then the power connector on the left (closest to the edge of the device) goes back to the air intake fan and the power connector on the right (closest to the middle of the board) goes to the air exhaust fan.

Is that the way it should be hooked up?

I think this is the right way? Correct me if im wrong

https://imgur.com/a/mCnVm

I think your image is correct in showing that the intake fan should spin faster than the exhaust fan.   But which fan gets plugged into which connector?  

Take a look at these two examples:

Example 1 - Exhaust Fan connected to inside fan connector.
https://c2.staticflickr.com/8/7626/27255413953_6608f5b2de_o.jpg

Example 2 - Exhaust Fan connected to outside fan connector.
https://www.freeclassified.co.za/images/listings/2017-01/antminer_s9_bitcoin_miner_1185ths_for_sa-1484675195-656-e.jpg


So I am not sure how to tell if my AntMiner S9 fan is connected properly...

Doing some more research with photos online, it appears there are definitely at least two different types of controller cards for the S9 - one with fan connectors closer to the intake fan, and one with the fan connectors closer to the exhaust fan.


As far as I can tell, the old S9s had their fan connectors closer to the intake fan, and the new S9s have their fan connections closer to the exhaust fan.


Here is a pic of the old controller board:

https://bitmainwarranty.com/wp-content/uploads/2016/07/S9-controller.jpg


Here is a pic of the new controller board:

https://cdn.shopify.com/s/files/1/2104/9141/products/2_cab2ffa1-bfc4-4c6c-b87c-6d8eb30d1935_1024x1024@2x.jpg?v=1504137417


So now lets limit our discussion of which fan connector to use to the new controller board.

Here in an example of first fan configuration on the new controller board:

First Fan Config:
Intake is Closest to Ethernet Port = Outside/Edge Connector labeled Fan 6
Exhaust is Farthest from Ethernet Port = Inside/Middle Connector labeled Fan 5

https://sc02.alicdn.com/kf/HTB1D0zfg5FTMKJjSZFAq6AkJpXaz/200204710/HTB1D0zfg5FTMKJjSZFAq6AkJpXaz.jpg


Second Fan Config:
Intake is Closest to Ethernet Port = Inside/Middle Connector labeled Fan 5
Exhaust is Farthest from Ethernet Port = Outside/Edge Connector labeled Fan 6

http://www.g-unitedgroup.com/bigpic/571/20170820163721.jpg


So for the new controller board, which Fan Config is correct?

For me (my s9) its "First Fan Config".
The labels say fan6 and fan5 but the software shows fan6 and fan3. https://imgur.com/CMv41MC

I switched both plugs multiple times and try to "feel" the different with my hand on the output fan, so i figured out witch connector is for front/back, but thats just a guess  ;)

Thank you.   Do you know what type of S9 you have and when it was manufactured?   Also, do you know the version of the controller board?  For example 1.19 or 1.20?

Antminer S9 13.5 TH Version, Januar Batch
Controller Board Modell 1.20

Hardware Version: 16.8.1.3
Logic Version: S9_V2.54
BMminer Version: 2.0.0

Don't know if this helps, but here's what my Jan S9 shows

https://i.imgur.com/3m0yNuv.jpg

Also in the Kernel Log my fans are also labled 2 and 5

Checking fans!get fan[2] speed=4320
get fan[2] speed=4320
get fan[2] speed=4320
get fan[2] speed=4320
get fan[2] speed=4320
get fan[2] speed=4320
get fan[5] speed=5880
get fan[2] speed=4320
get fan[5] speed=5880
get fan[2] speed=4320
get fan[5] speed=5880

Maybe you could start with one fan off just long enough to see which one reports RPM in the kernel log? Don't burn it up!!!

I switched cables on my S9 to the 2nd fan config, and now both fans are spinning less quickly and still maintaining the same temperatures.    Fan Noise has decreased noticeably.

I have a

Miner Type: Antminer S9-14.0T
Hardware Version: 16.8.1.3
Kernel Version: Linux 3.14.0-xilinx-ge8a2f71-dirty #82 SMP PREEMPT Tue May 16 19:49:53 CST 2017
File System Version: Mon Nov 6 17:17:48 CST 2017
Logic Version: S9_V2.47
BMminer Version: 2.0.0
Controller Board Version: 1.20

Hi

What would happen if I use 6000 rpm on both sides?

Interested in reversing the airflow also. Anybody try this yet?

I did for a few minutes... temps reported were way lower.  That's why I asked about temp sensor placement, if he are at one end, then they either read hotter since they are last to get air, or cooler if they are first.  I imagine bitmain planned for this and thats why temp tolerances are what they are.  Worried that the "cooler" reading may in fact be hotter chips.  Anyone know for sure?