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Author Topic: Overheat Protection for Antminer S5 50cent cheap, 100% safe and easy to install!  (Read 1991 times)
RadekG
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July 09, 2015, 09:03:31 AM
 #1

Hi friends,

after many months of bitmain's refuse patch a bug which causes fatal overheat to our S5 during internet connection fail I decided to make my own protection independent to miner software and not void our warranty. So again, THIS MOD WILL NOT BREAK YOUR WARRANTY. Just remove this mod before RMA.

If you ask how, the answer is super easy - bi-metal thermostat, similar which is used in professional lighting devices, battery packs and many other devices which needs reversible protection fuse. I purchased it from e-bay, for example: 10PCS KSD9700 Bimetal 90 Degrees NC Temperature Control Switch For Transformers

http://www.ebay.com/itm/151348547627?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

10 pcs for less than 5 bucks with free shipping!

You can use any temperature you wish to shut your Antminer down, but it MUST BE "NC" version - Normally Closed. This one shutted my S5 at 101C which is still acceptable as critical overheat temperature.
This switch will shut down PSU, so NO POWER comes to your S5 until it cools down about 10 minutes, then it power on your S5 back.

http://pantin.cz/ants5mod/DSCF6168.JPG

Put bimetal switch between heatsinks.

http://pantin.cz/ants5mod/DSCF6169.JPG

Do not remove the silicon sleeve, it prevents the switch to move out.

http://pantin.cz/ants5mod/DSCF6170.JPG

Remove your paper clip from your PSU and connect the your new bimetal switch on place of paper clip. You can use some wire extension with dual pin header to perfectly match green and black pins on PSU ATX cable connector, it is up to you how precise you wish to be.

This protection is 100% working and can be used for ANY Antminer and will protect your Ant even if your FAN COMPLETELY FAIL.   For those who are extremely paranoid, you can use switches in serial to double, triple or whatever secure they will not fail. You can use unlimited antminers switches connected in serial to control only one PSU (for example if you have 4 ants connected to one IBM bladecenter PSU, just connect all four ants serially, any1 overheated will shut down PSU).

Hope this cheap and fast mod will help you.

Regards,


Radek


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dunand
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July 09, 2015, 11:05:02 AM
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This looks like a good solution. 90 degrees between the heatsink is very hot. 80 would be enough imo.

Good work!
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July 09, 2015, 02:28:15 PM
 #3

This is the best hint I've seen.Simple and genious.Thanks!
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July 09, 2015, 03:15:35 PM
 #4

the idea is cheap but

to be really sure do two things the op's and  Just add a fan as a pull

connect it to your psu for power not the s-5 and

leave the stock  fan connected to your s-5.


http://www.ebay.com/itm/Nidec-Beta-V-TA450DC-B34262-57A-Case-Fan-120-mm-x-38-mm-12VDC-8-Amp-/321196720453?



50 cents plus 4 bucks =  $ 4.50 a miner


pretty much fool proof with the two combined

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RadekG
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July 09, 2015, 07:27:21 PM
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This looks like a good solution. 90 degrees between the heatsink is very hot. 80 would be enough imo.

Good work!

Thanks! The chips survive extreme temperature while running, I had some failed due to internet connection lost and some chips were unsoldered (about 180C at chip package, so die could be 200+). After pressing them back to PCB hash board worked again. That is why I choosed 90C. It is up to one's decision which temp is safe.

I think it is very clever idea to remove side panels and check temperature of each chip during operation to make sure all chips are cooled properly. I found some chips are over 100C while S5 shows 55C only. Repasting helped a bit.

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July 11, 2015, 09:26:09 PM
 #6

A Very Helpful method, Thanks mate for sharing.
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July 11, 2015, 09:48:51 PM
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waw great idea man..  Shocked
it cheap too, thanks for your idea, i will order it.
RadekG
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July 14, 2015, 09:06:16 PM
 #8

the idea is cheap but

to be really sure do two things the op's and  Just add a fan as a pull

connect it to your psu for power not the s-5 and

leave the stock  fan connected to your s-5.


http://www.ebay.com/itm/Nidec-Beta-V-TA450DC-B34262-57A-Case-Fan-120-mm-x-38-mm-12VDC-8-Amp-/321196720453?



50 cents plus 4 bucks =  $ 4.50 a miner


pretty much fool proof with the two combined

Yes, doubling or quadrupling fans make it yet more fool proof. You can also quadruple fans and each of added connect to separate PSU connected to three different UPS each at different network phase Cheesy

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mooseCavalry
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July 24, 2015, 02:18:12 AM
 #9

I have an S5 that managed to burn a chip.  If bitmain honours their warranty and send me a new one, this will be implemented.

This is a reasonable alternative to using aftermarket fans.  The issue I see with aftermarket fans is they may not provide the same CFM air transfer as the stock fan unless mounted in some less than conventional configuration, such as 4x fans set up in a contra-rotating fashion (two per end - soldering fun).
(see https://en.wikipedia.org/wiki/Contra-rotating_propellers)
innerchaos
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July 27, 2015, 10:58:01 PM
 #10

Wow I did not know that such a component existed.

Ordering now.... Thanks.

Make a new BTC Address (just for privacy issues on your wallet) and post it in your signature and I will make a small contribution.



I tested all of my S5's for the overheating due to loss of internet and found some that will.

If i disconnect the Cat 5 Cable or Power down my switch/hub then all my miners will eventually stop hashing and will cool.

If I just reboot my ISP cable modem then some of my miners will get extremely hot (over 85c) and not Auto Shutdown even though I have "Stop running when temprerature is over 80℃" checked.

It is like they think the Pool is still live because the Cat-5 cable is still connected to a live connection (in this case just a switch) but it has nowhere to send the hashes.

as soon as the WAN becomes active the S5's start to cool on their own because the hashes are now getting sent to the pool.

I was concerned if I ever lost my internet connection for more than a couple of minutes. how many miners would I lose.

With this easy solution I am greatly relieved, and cant wait to receive them and install these switches.
QuintLeo
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August 16, 2015, 10:17:05 PM
 #11

I prefer my 0 cost method, especially since I want the fans to run at 100% constantly anyway for maximum cooling and maximum lifespan of the S5.
generalt
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August 17, 2015, 01:00:27 AM
 #12

Great idea.  I wonder if there's any way to adapt that to use the server power supplies.

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August 17, 2015, 03:33:23 PM
 #13

Great idea.  I wonder if there's any way to adapt that to use the server power supplies.
Of course you can. Just wire the switch(s) in series with the PSU's control pins and your external on/off switch. If you are using the GekkoScience breakouts for IBM 2 or 2.8kw PSU's the control switch will select either local (just the switch) or external control. Use the external setting and wire as needed to toggle the on/off.

Since the GekkoScience look for a (+5) voltage source to turn on you would the thermal switch between the +5 output and the remote on/off pin. Now ya just have to make sure you always have the breakout board switch set to External.

On other breakouts for the HP1200w PSU/s wire the thermal switch in series with the connection to pin-4 that turns on the supply.

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