Have you tried swapping the PSU from another miner?

Where did you get your control boards from?  It may be that your control boards have firmware that is either hacked or has a dev fee.  I think there is a technique to reset the firmware or you can try loading BraiinsOS via the SD card.  You’ll need to move the jumper at JP4 to startup from the SD card. Take a look at the following website to get started.
https://docs.braiins-os.org/

Also, read the forum at this link and see if that helps
https://bitcointalk.org/index.php?topic=5131546.0

What firmware are you using and how many pools do you have programmed in?   Have you tried going to a different pool or at least a different URL of the same pool if that is an option?

I'm using a NETGEAR N300 WiFi Range Extender (EX2700) 32.99 at Amazon, to provide internet to my S7 miners at my cabin just to keep the cabin warm.  It is much easier than running CAT 5 cable and it works great.  Just plug in a short ethernet cable between the Netgear and your Pi, no drivers needed.

Phil,

I just installed a few switching PDUs at my data center and here are numbers from the wall that I have on some of my S9i-14.0 miners.  All are running 20181107 firmware.  I may install some other firmware on the miners when I have time to monitor them.  Temps are around 62-67.  Firmware has been rock solid and I did not have to install the upgrade failure firmware first.  I believe I have a total of 55 S9i-14.0 miners running this firmware so this is just a sampling from 1 cabinet.

Average     Real Time     Real Time Power   W/tH
14.010          13.955          1207 W          86.5
14.126          14.124          1210 W          85.7
14.226          14.279          1195 W          83.7
13.988          13.985          1190 W          85.1
13.996          13.927          1162 W          83.4

I just received 1 M10S today, getting 51 tH/s and 3213 watts at the wall in low power mode.  Exactly 63 W/TH.  I don't think my PDU can handle regular power mode so I didn't test it; I was already getting warnings on the PDU with low power mode set.

NOV 17 Firmware 1023 LPM on a 13.5 TH/S S9. Here are the readings I have so far.  Definitely decaying hash rate after a few hours.

GH/S RT   GH/S AVG   W/TH      WATTS AT WALL   TIME
13597   13458   87.6      1,274                   START
13600   13607   86.5      1,273                 2 HOURS
13455   13613   86.5      1,273                   3 HOURS
13555   13576   87.0      1,277                   4 HOURS
13404   13571   86.3      1,266                   5 HOURS
13306   13489   86.7      1,265                   9 HOURS
13302   13482   86.7      1,264                  10 HOURS

Edit: Update for 20 Hour data point.  Sorry about the formatting issues, not sure how to fix that

13076        13343        87.5          1,262                20 HOURS

The only reason I call it a patch is because the regular firmware updates were all over 60 MB and this one is less than 1 MB.  It replaces bmminer and a few other files.


I've heard of people having issues with the November 17 firmware since it was released but I personally haven't had any issues with it except for a very few problematic miners that only run on fixed frequency.

Is everyone running Nov 17 auto-tune firmware with the LPM patch or is there a variety of firmware that causes the same result of decaying hash rate?  Also for CCG or others who are able to use the 10/22 LPM patch are you running the 10/22 or 10/23 LPM update?

A few people have reported here https://bitcointalk.org/index.php?topic=5055138.60 about a decaying hash rate after some period of time with the LPM patch from Bitmain so I've decided to do a 12 hour test.  Not sure when I'll be here to read the measurements but I will try to do at least a 3 hour, 6 hour, and 12 hour.  So far 2 hours in I'm reading 13.607 th/s average at 1,177 watts at the PSU, assuming close to 1,273 watts at the wall.

I did mention that in the above post.  The test was relevant to me so I could confirm that LPM had no effect on the software (which is something I had already assumed and wanted to verify).  If anyone wants to argue that the 10 minute test is irrelevant I would agree with them.

Same 10 minute limited test.  LPM makes no difference in BMMINER880 firmware, it would probably show closer numbers with a longer test.

I have limited results as I only have access to a few machines while away from my data center.  I was doing power measurements at the power supply tonight on 1 machine and only letting it hash for 10 minutes before taking readings.  Machine is an April 2017 delivery Bitmain S9 13.5 Th/s, power supply is a Bitmain APW3+-12-1600-A3, also delivered during that time.  Voltmeter and Ammeter are both Fluke.  Again I want to stress that this is only 1 machine and very limited testing since I can't wait all day to take readings.  This power supply is about 92.5% efficient at 100 amps according to this post https://bitcointalk.org/index.php?topic=5045057.0. Numbers are right around a 12.5% power savings and an overall efficiency improvement of 14.5%.  I've only updated 3 machines so far and have have hundreds to go as well.  Hoping to save about $2,500 in power costs per month with this firmware.

Nov 17 Firmware              12.15 vdc  110.6 amps  1,344 watts  13.226 th/s avg  101.6 w/th    at the wall estimated ~1,453 watts
LPM Patch and checked     12.16 vdc  96.7   amps  1,176 watts  13.554 th/s avg  86.8  w/th    at the wall estimated ~1,271 watts
LPM Patch and unchecked  12.15 vdc  110.5 amps  1,343 watts  13.424 th/s avg  100.0 w/th   at the wall estimated ~1,452 watts

Below is a copy/paste of your log issue.  I’ve only put LPM firmware on 2 machines so far and haven’t had any problems.  You could try different firmware as others have stated or reboot a few times to see if it comes back.

On a stock S9 I can confirm that the LPM firmware either modifies or replaces the bmminer file, I would assume it would replace a modified bmminer as well.  The LPM bitmain bmminer does not work with slushpool.

I added Taserz bmminer after the update to LPM and it does work with slushpool.  This modified bmminer seems to run faster with LPM checked, maybe someone else can confirm this, I don't have time to check on multiple machines at this time.  bmminer880 650 freq 13.950 th/s.  With LPM unchecked I see readings closer to 13.825 th/s.  I don't have access to power readings at the moment unfortunately.

I can also confirm that all shares are rejected at slushpool with or without LPM checked.  I have also seen that bmminer has been modified with this LPM update.

For those that are doing power and hashrate analysis, is this with or without LPM checked?  I'm trying to determine if you are getting more hashrate with less power while in low power mode.  Also, if someone can do analysis with and without LPM checked that would be helpful.

I’ve imported miners into 3 different states and the majority of miners have been delivered to a residential address without an issue  If you don’t want them shipped to your address you can always get a personal or business address at a UPS store or similar but I’m not sure they’d be too happy accepting 200 miners in one day.

Are you using an air conditioner to cool the intake air?  80 degrees Celsius doesn’t make sense with the air restriction and running 3 boards.

https://www.ebay.com/itm/Antminer-S1-S3-S5-S7-S9-T9-D3-L3-Fan-Duct-Cooling-Shroud-6-Inch/163303439279?hash=item2605a4bbaf:g:StcAAOSwEMdbYO1U

Use with:
https://www.lowes.com/pd/Lambro-6-in-x-96-in-Aluminum-Semi-Rigid-Flexible-Duct/3240913
Or
https://www.lowes.com/pd/Lambro-6-in-x-300-in-Foil-Flexible-Duct/3319766

Six inch flexible ducting versus the four inch that you are using.  You don’t need the adapter because the six inch ducting will fit over the antminer fan.

---

I just realized that maybe it would be easier if I said to use a larger diameter ducting.  150 mm instead of 100 mm.

Just a few questions:
Are you using a modified bmminer?  And are all your miners on 4” flexible tubing?  If yes to both then you should be underclocking your miners while using 4” tubing.  If you have to use flexible tubing you should be using 6” tubing because 4” is too restrictive especially with longer runs.