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%3AIT10 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.JPGPut bimetal switch between heatsinks.
http://pantin.cz/ants5mod/DSCF6169.JPGDo not remove the silicon sleeve, it prevents the switch to move out.
http://pantin.cz/ants5mod/DSCF6170.JPGRemove 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