Topic: ANTMINER S2 Discussion and Support Thread - page 143. (Read 355820 times)

I get many of these on p2pool with the S2. I don't remember getting them with the S1, but I'm not 100% sure. Ghash.io was also reporting a fairly high number of duplicates with the S2 when I tried it.

for those having power supply problems - I am interested what your room temp is at.  if i understand correctly higher temps = lower efficiency so you cannot expect the power supply to perform the same at 60 degrees F (15.5 Celsius) vs 80 degrees F (26.5 Celsius).  this also would make a difference as to where it is pulling air from (inside the case B2's vs outside the case B2's).  i for one replaced mine about 2 hrs after receiving it due to the fact that i wanted to overclock it (if possible).  but i did not have any problems with my unit using the stock PS with the room temp at 60 degrees F or below.

The basic problem is the small psu

In my case, the unit worked fine for half a day then shut down.
Once I moved  two S1's to a different outlet and opened the case of the S2 it started working again and has been stable for a while.

You say you have two units, have you tried one at a time by itself?

On a side note found it not to be the slot it was mining in but one of the cards tripping the PSU protection.
It either looks like one of my miners needs more power then the power supply gives or one of the blades is faulty and tripping the surge protection.
I ordered a 1350W platimax enermax power supply to find out if this resolves it using all 10 blades
I have another antminer S2 which is running fine with the 1000W enermax powersupply but I think these 1000W power supply's are cutting it really close to max usage of the power supply and will probably end up frying it in the end.. not something I am looking forwards to.
On other thoughts I hate to spend another 250 euros to replace the power supply.

I looked around their system image pretty carefully and I couldn't find anything that was writing to the SD. Yes, its mounted, but it should still be idle and consistent. It is possible I missed something, but I don't think so.

Reducing the power load to a minimum before physically powering it down might be more important.

Best method is to log in through ssh and issue the "halt" command, wait for a few minutes for things to cool down.
This way you give the psu time to cool down and most important the filesystem on the sd card is unmounted.
If you just flip the power switch under full load chances are that you get a power spike on the 12 volt rail and damage the mounted filesystem.

Unplug ac and short circuit with a coin.

You can flip the 110/220 switch back and forth while unplugged to reset internal relay

shutdown -h now

You can try pulling the ethernet cable first. No network = no mining = very low load.

The issue you are experiencing is that the PDUs internal relay in short circuited to be on due to the PSU pins being tied together with a paperclip.

If you remove the paperclip, you'll hear the relay in the power supply reset and once you put the paperclip back in, it will start right up.

can you clarify the steps to do that please?  i'd like to try it.  thx.

I am turning mine off with the powerdown command via CLI. Tested it 4 times and it comes back up with no issues for me. I have a B2 S2.

The stock gold psu is awful
Mine dead after 1 day

I've dropped about 3 post about OC-ing. Nobody responded....

At 225Mhz more then 4% HW.

I couldn't figure out how to OC these... I think there is a bottleneck on the voltages to the chips.

If you take the power away from a psu under full load the psu fan will stop instantly.
This way you overheat the psu so you will have to wait for it to cool down.

Any one testing these yet overclocked?

Am just starting a 12 hour test @ 200 chip frequency up from 196.

Initially it appears to made very little difference. about 30-50GHZ increase over my first hour, maybe a 2% increase in HW errors. Temperature OK. Power supply OK. I'm thinking to overclock these effectively we are going to need to increase chip voltage a little, increase chip frequency much more and thus another power supply to take the extra load?

Anyone dabbling with this yet?

 

Several people seem to be concluding that their power supplies are "dead" or malfunctioning based on them refusing to turn on for several minutes after turning the S2 off.  FYI, all three of my batch 1 S2's act this way - when you turn one of them off, you have to wait at least 10 minutes (haven't timed it, but it's more than 5 minutes and less than 20 minutes...) before they will agree to turn back on again.  disconnecting power cord, swearing, etc have all proven ineffective. 

I don't think this is a malfunction - i think it must be a design "feature" of this particular power supply.  Or perhaps it's the way they are powering off... typically, you would not shut off a server by flipping the switch on it's power supply.  you'd issue a shutdown command in the OS and have it gracefully shut the system down.  I don't think that is possible with the S2 as the ATX motherboard cable is not utilized.  it's really unfortunate that the BBB board was not powered by the ATX motherboard cable - that would have gotten rid of the "paperclip" mod and perhaps made it possible to gracefully power on and off with a soft button the front of the case. 

But the way it's designed, when you flip the power supply off while the case is open, i see the system power off then, after about .5 sec, it powers on for just a fraction of a second.  a little blip. 

Perhaps this blip is causing two problems - corrupts the SD card, and trips something in the power supply that stops it from powering back on for several minutes.

I'm very interested in hearing if replacing the power supply solves the corrupt SD card issue.  that would be great!