Bitcoin Forum
December 13, 2017, 09:43:57 AM *
News: Latest stable version of Bitcoin Core: 0.15.1  [Torrent].
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Antminer fire prevention  (Read 962 times)
Odetas
Jr. Member
*
Offline Offline

Activity: 56


View Profile
July 21, 2017, 11:54:59 PM
 #1

So, I picked up a couple of Antminers S1-S5 and a couple of them had burnt out connectors.  The boards were fine and so were the headers, but the connectors were burnt.  It is a very good idea to use Dielectric grease to spread the thermal load across these connectors.  Dielectric grease works wonders in that situation. Air is actually an insulator, after a while it is like a convection oven. If you gap out the air and the grease spreads the thermal load, then the connector stays cool. Problem with plastics is that they have a critical autoignition temperature, once reach it they light up.  Take a lighter to an old Molex connector, you'll be surprised at how it will keep going once it is lit up.  Loctite sells a tube for $5 and makes for good insurance.

I also noticed that one of the connectors was getting especially hot out of four on an S5, I thought that part of the board had a particularly high current draw or something (this is after applying dielectric grease).  Nope, the connector was from the main bundle vs from the modular PCIe connectors.  Must be something about how the winding or the circuit is setup in the PSU I'm using. Doing a round robin of the connectors on that particular machine now has the connector temp relatively even.

I'm trying to see if anyone has a thread going or pics of the parts that fail on the board due to heat.  I'm wondering if coating them in some sort of thermal paste to spread the load would help them be more reliable. 
1513158237
Hero Member
*
Offline Offline

Posts: 1513158237

View Profile Personal Message (Offline)

Ignore
1513158237
Reply with quote  #2

1513158237
Report to moderator
1513158237
Hero Member
*
Offline Offline

Posts: 1513158237

View Profile Personal Message (Offline)

Ignore
1513158237
Reply with quote  #2

1513158237
Report to moderator
1513158237
Hero Member
*
Offline Offline

Posts: 1513158237

View Profile Personal Message (Offline)

Ignore
1513158237
Reply with quote  #2

1513158237
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
NiHaoMike
Sr. Member
****
Offline Offline

Activity: 266



View Profile WWW
July 22, 2017, 12:35:48 AM
 #2

Replace damaged connectors with new high quality ones. Rather than GPU type power connectors, you might want to look at using Anderson Powerpoles or R/C type high current barrel connectors. Those are rated for a lot more current.

I use cryptocurrency and solar power to help my best friend Naomi Wu... And I'm proud of it!
Odetas
Jr. Member
*
Offline Offline

Activity: 56


View Profile
July 22, 2017, 12:48:00 AM
 #3

I think that the materials for the common molex are crap and rated pretty low.  That's why they went to 3 connectors/hash board on the S7-S9.  Do those connectors even replace the ones on the PCB directly.

BTW, you can tell that it starts with one hot pin:

You can tell that it started with one pin getting very hot:



Only 5 hours of mining at home on the wall plug w/ S5



NickoN
Newbie
*
Offline Offline

Activity: 6


View Profile
July 22, 2017, 08:10:28 PM
 #4

You can tell that it started with one pin getting very hot:

http://i.imgur.com/ZvPhP3n.jpg


Oh wow. It seems like dangerous to leave it on for the night.
Odetas
Jr. Member
*
Offline Offline

Activity: 56


View Profile
July 24, 2017, 12:42:52 AM
 #5

If you take the steps above that I've outlined, you can be safe.  I've had them running for a while now.  I also felt the power cord to the wall and it was hot, so I changed to a higher gauge one that I had and was much better thereafter
NotFuzzyWarm
Legendary
*
Offline Offline

Activity: 1288


Evil beware: We have waffles!


View Profile
July 24, 2017, 03:17:08 PM
 #6

I think that the materials for the common molex are crap and rated pretty low.  That's why they went to 3 connectors/hash board on the S7-S9.  Do those connectors even replace the ones on the PCB directly.
<snip>
The Molex PCIe connectors are *not* crap...
The only issue with them is in the past designers choosing to push more current through them than what they are rated to carry (for example KNC) and worse, not taking into account what is often mated to them eg, cheap (un-plated) or worn out PSU connector sockets with too-thin wire. When that happens of course they discolor and probably burn.

Stay within their stated ratings and use the correct gold-plated or at least gold-flashed socket pins along with decent 16ga wire and they work great.

-Joshua Zipkin aka Joshua Alexander leaked AMT A1 miner skype chats http://bit.ly/1Qjt6lj
-For bitcoin to succeed the community must police itself.
-Support Sidehacks miner development. Donations to:   1BURGERAXHH6Yi6LRybRJK7ybEm5m5HwTr
Odetas
Jr. Member
*
Offline Offline

Activity: 56


View Profile
July 24, 2017, 05:38:13 PM
 #7


The Molex PCIe connectors are *not* crap...


I don't mean to blanket genuine Molex connectors, my sentiment was that the "Molex" connectors used in nearly everything these days are very generic and god knows who the supplier is and their standards.  So, some relatively cheap Dielectric grease goes a long way in this situation.
philipma1957
Legendary
*
Offline Offline

Activity: 1946


A new tool for prediction https://bitvol.info/


View Profile
October 15, 2017, 01:11:02 PM
 #8

The Molex PCIe connectors are *not* crap.
There CRAP if its melting his sh!t!
[/quote]


my kia forte  has a speedometer  the reads 120 mph  I can get it to that speed  on a downhill straightaway.

If the car  is pushed to those speeds it is unsafe.

The car can cruise at 80 mph for hundreds of miles with no issues.


Most of the miners are asking the molex  to do 120 mph  and not cruising at 80.

and they talk and think just like you wrote in the quote.

Please support sidehack with his new miner project Send to : 1BURGERAXHH6Yi6LRybRJK7ybEm5m5HwTr
I mine alt coins with https://simplemining.net I see BTC as the super highway and alt coins as taxis and trucks needed to move transactions.
Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!