Ok, I had possible short internet blackout or disturbance (was not at home).
came back to observe the following:
One batch 2 miner (9/15 system) fully recovered by itself.
Second batch 2 miner (10/23 system) did not recover, both fans were rotating, but not full tilt, air was coming out hot and miner was making a solid noise (not periodic, but continuous beeping); it was obviously not mining and did not recover the internet connection. I switched it off, let it sit for 5-10min with an external fan blowing air toward intake. Once air was coming out ~ambient, I switched the PSU back on and miner recovered internet and is hashing.
Conclusions:
in this batch 2 (updated to October system), fans were NOT rotating at high speed after internet loss and miner did not recover by itself upon internet restoration, but miner with 9/15 system did (the opposite of what you would be expecting).
The good news is that it did not burn itself either.
came back to observe the following:
One batch 2 miner (9/15 system) fully recovered by itself.
Second batch 2 miner (10/23 system) did not recover, both fans were rotating, but not full tilt, air was coming out hot and miner was making a solid noise (not periodic, but continuous beeping); it was obviously not mining and did not recover the internet connection. I switched it off, let it sit for 5-10min with an external fan blowing air toward intake. Once air was coming out ~ambient, I switched the PSU back on and miner recovered internet and is hashing.
Conclusions:
in this batch 2 (updated to October system), fans were NOT rotating at high speed after internet loss and miner did not recover by itself upon internet restoration, but miner with 9/15 system did (the opposite of what you would be expecting).
The good news is that it did not burn itself either.
This was an issue with the S5's. I first reported it back in the S5 thread several months ago. I'll never be able to find the thread. I came very close to burning up all my S5's so I chose to hook up all my fans directly to the PSU and not rely on the controller. Simple molex 3/4 pin board. User "thedreamer" prompt the idea a while back. Never had heat issues or any issues since then.
EDIT: Wasn't aware the S7's had a manual fan control. I never upgraded my S5 firmware that I believe does have that control. Don't remember, but since my S5 firmware is so stable and consistent I did not want to upgrade. Just moved fans to constant power.
yeah, i remember your posts, it was good insight.
The point i was trying to make was that bitmain warranty was suggesting to update to 10/23 system that should have addressed the issue.
My surprise was that it did not (at least fully), although miner did not burn.
surprisingly, batch 2 miner with older system did not have any problems.
My guess, each and every case is different, which makes it challenging to generalize.
..so it does
