Bitcoin Forum

before asking the question it is better to interduce what i am using in

Antminer S7 (Bought from BitMain)

BitMain PSU (Bought from BitMain)

220V & 10-16A & 3*0.75mm^2 Power Cord for the PSU

A DAIYO laptop power protector which supports 10-16A & 250V (http://www.daiyo.com.sg/index.php?route=product/product&product_id=110)

Yesterday I recived my antminer S7 so when I had connected PCI pins i connected the PSU's power cord with that laptop power adapter i said.

Then the antminer powered up with variable fan speed. Then i connected the network cable then when i was going to sit in front of my pc to config the antminer it just powered off and i didn't understand which one powered off first PSU or Antminer but they both had turned off.

i ran and unplug the Power Cord (It was very hat) so that i thought that the pwoer cord may has burned so to test that i connected that to my compuetr psu and my computer didn't powered up so then i knew it that it was burned but 30min after my father test that again and this time my computer powered up .

what is the problem ?? Pleas help

What made Antminer to turn off automatically ??

Have i done anything wrong ?

Someone told me i should have used a 3*1.5mm^2 Power Cord is that the answer ?

Has the antminer been damaged ??

here is a picture of my antminer
http://i.stack.imgur.com/K59Jz.jpg

Where do you get stats for the surge protector/adapter.   Just looking at that thing it looks pretty cheap.   Is it truly rated for this kinda power? *read the stats on back of packaging.  Have you tried without that adapter even though it say's up to 16a just looks cheap?

And I could be off base and it is perfect.  Just have not seen anyone post before that I know of using a 8 dollar dollar adapter for so many watts.

it was the only adapter availibale in local markets . the questions is do you think thats the problem ??

The other thing is it sounds like your using your power cable from a PC for the bitmain server PSU?  I personally use a nicer heavier gauge cable for my bitmain PSU's that goes into a PDU.

If your using a cheap power cable i could see that as a reason for it to heat up possibly.  Don't know enough to say since don't know what your using.  There are different AWG cables.  Some are much nicer then others.

http://imgur.com/yzZyHsm

that is what i'm using 220V & 10-16A & 3*0.75mm^2  it was very hard to find a cable which support 16A and the yes it was very cheap but the was the most expensive in those cheap cable  :-\

and it is impossible for me to buy a PDU

do you think the antminer has been damaged ?

If the power cord got very hot, then that means it's either faulty or too small or gauge to handle to power being pulled through it.  You need to get a new, bigger gauge cable to start.  Then you can determine if there was damage to the miner or psu (probably not).  The miner likely shut down due to lack of power due to the crappy cable.

If the power cable got hot where it plugs into your adapter, then it could also be caused by the adapter.

That is the problem it could be either of these.   The adapter just does not appear to be something I would send 1300 or more watts through.

The cable I think is to small of gauge most likely.  Getting hot is a pretty good indicator of this.  The best of "local markets" might not be good enough I order a decent PSU cable from amazon when I'm getting one for a server PSU like the bitmain one.  I have a feeling most local markets unless you have a good computer store is not good enough.

i just tried to test the PSU

unpluged all PCI's then pluged it to power but the fan didn't run

is iit ok ? or the fan should start ?

I would first try eliminating things.  Can you try without adapter?

See if it powers up without it go to the IP and access it and see what miner say's.  If it works without adapter then look at cable next and see if it get's hot.  If so stop using it if truly hot to touch and get a better cable.

that cable for your power cord is totally and completely not acceptable.

1.4mm is good .75mm is a fucking joke.

FIRE FIRE FIRE!!!!   can I make it any clearer then that?

 tell me your country and I will search a proper power cord  for you.  As dying for mining coins is not acceptable.

DO NOT PLUG IT IN WAIT FOR A NEW CORD!!!!!!!!

I'm in Iran

just fucking cheap chinese cables are availibale here

I told the sellers houndred of time that i'm gonna use a 16A device which is going to be 24/7 on, and they all gave me this fucking cable

I have a couple of spare power cables with 1mm2 internal wires that I can try to send you from France if you want.

I'm using 18AWG (0.824mm2) for my S3 power suppply (850W)

and as they have a EU plug, you won't need the travel adapter ;)

After 4 hour of looking in stores to find a 1.5mm^2 cable

Finally I bought two cable

1.5mm^2  250V   10A

1mm^2 250V   10-16A

Which one I should use ??

I don't see why the 1,5mm2 would only be rated 10A.

I would use this one.

Yes, that's strange  ???

Before powering it up again it was very emphasized on antminer s7 to give a shake to it and check if any of tge heat sniks have become losse or fallen

I gave a shake to it and I felt a little that there is something in device which makes sound. Do you think I should open fans and take a closer look at hashboards ??

Yes but get a strong flashlight do both fans and look all the way through the miner

Is this good enough?

http://www.ebay.com/itm/1M-EU-Plug-Main-Power-Cable-Silver-Plated-Audiophile-Hi-end-4N-OFC-15A-250V-Pro-/231833122229?hash=item35fa54b5b5:g:hPUAAOSwdpxUUzgA

I think the end that goes into the miner is wrong  but it is a very good cable


http://www.ebay.com/itm/PDU-PSU-IEC-C14-male-to-C19-adapter-IEC-C19-to-C14-adapter-/151851542263?

that cable with this adapter would be good.

The power cable is fine, you do not need a C19 adapter.

https://bitmaintech.com/productDetail.htm?pid=000201505040743496917U7kGsCm0694
Interface Type
IEC320-C13

do not buy Chinese equipment, which fall due

http://www.icintracom.biz/cavo-alimentazione-c19-a-schuko-2-5m.html

Think about this comment for a few seconds and I think the humor will come to you.   Chinese equipment..... that is where most miners are made :).

So the gear your powering in almost all case is Chinese made on miners.

by let's be realistic, we all know who use poor quality materials, I bought a couple of times by the Chinese, and I am talking about small equipment, houses for hardisk with power, even power cables for psu,
result?:
the houses for hardisk and burst, even burning the hard disk,
the power cord had become glowing, and very warm.
and I guarantee you I'm not the only one.
It is not a question of racism, but make a comparison with other products in the world,
type america, Italy, Germany, France, etc ....

almost everything is produced in China because it costs very little work, that's why they're cheap, but they use bad material I guarantee 100%
my post is deleted now that I know, but the truth must be told.

I'll take an example
in china producing the tomato cherry, which is unique in the world is produced only here in Sicily.
Imagine this product as they do in China?
let's stop by

as I said earlier, the bitmain PSU doesn't use a C19 cable, but a standard C13.

Now i tested the 1.5mm and it is working perfectly but the fans noise are driving me crazy

It's like Lavendre Town Syndrome  i may commit a suicude



fan details http://imgur.com/YAatYy7


can i reduce the speed ?? its very bad
 

set your miners freq lower  if you are freq 700 set freq to 500 and set fan speed to 30

check your temps  with freq 500 and fan speed at 30

if they are 60c-65c you are okay.

this will reduce your power use and reduce your hashing speed

 https://i.imgur.com/g0OA1T8.jpg


you show freq 700   >>>>>>>>>>>>>> drop to 500

the  fans are at 4000rpm   = loud >>>>>>>> drop to 30% = 2800 rpm not bad

temps are 50c really good >>>>>>>> tell us what this goes to after 1 hour


if freq 500 and fan 30% is under 60c after 1 hour
try freq 512 and fan 30%

if freq 500 and fan 30% is 65c or higher

go to freq 500 and fan 35% ======

I don't wanna reduce hashing speed

Frequency is on 700 now and boards temp are about
50c

I set the freq to 650 and set fans to 70

Boards became cooler but the fans speed is still the same

yeah there is a trick to the fan speeds.

65% is full speed.

try 50%  you should drop rpm to 3300 let me know  if temps are at 60 and fans at 3300rpm

i think that 3300 rpm will keep you cool at freq 700


i am making a guess to correct fan speed but i should be close

why is my hash rate is so unstable

http://imgur.com/a/Se2H3

freq is 650 and fan speed is 3,720

is it because of my latency? (I'm suffering from unstable latency)

here is my ping chart

http://imgur.com/YSslfF2

you have a poor ping speed.  looks over 250 most of the time.

are you mining at stratum+tcp://eu.stratum.bitcoin.cz:3333  ?

try joining kano.is

https://www.kano.is/

Mining configuration:
Click on the Login/Register link to register a username to mine with,
or mine directly to the pool without registering, using a bitcoin payment address as your username.
No password is required.

e.g.
./cgminer -o stratum+tcp://stratum.kano.is:3333 -u Kano.worker -p x
 or
./cgminer -o stratum+tcp://stratum.kano.is:3333 -u 1KanoiBupPiZfkwqB7rfLXAzPnoTshAVmb_worker -p x

If you have network issues using port 3333, you can also try:
./cgminer -o stratum+tcp://stratum80.kano.is:80 -u Kano.worker -p x
 or
./cgminer -o stratum+tcp://stratum80.kano.is:80 -u 1KanoiBupPiZfkwqB7rfLXAzPnoTshAVmb_worker -p x

You can also try any of:
stratum+tcp://stratum81.kano.is:81
stratum+tcp://stratum443.kano.is:443
stratum+tcp://stratum8080.kano.is:8080

If I have this correctly, computer power cords expect to get 17-26V of power from AC (at te wall) and would also expect to only have 70-100W going through them.

Meaning:
The antminer S7 is 1200/100=12x the currente expected through the computer PSU.

You may have to go to the website of the company the PSU was bought from (not Bitmain) and purchase the correct extension.

As for your computer, the first time you plugged it in, it may ave been connected wrnge but the fact that it overheated means that tthere was too high a curent going through it.

he got a good power cord  with proper gauge his miner now works

suddenly i noticed that my hashrate droped from 4.3 to 3.9 and i took a look to the s7 and saw the LED is off on one of the hashboards but after 40s it became on again and my hashrate increased to 4.3

what caused that ?

yeah it drops connections some times.

are you still mining on the site with 250 + ping times

long ping times can cause a drop out of 1 or more boards.

did you try a different pool to see if you can get ping times under 150?

Probably a good idea to load up a computer, go to the command line and start to ping all of the main pools. This will make it easier for you to find the onces with a fasterping speed (geographic location is not usually a factor as different cabelling is used!)
Antpool and Slush's pool are quite fast (these are the ones that I have tested through normal command line pinging though it depends on where you are and your internet provider and speed).

I would say fans at 30%-35% is manageable for your ears.  make sure the temps dont go too high, 60-65 should be okay.  That way you dont have to suicide yourself :)