@Juville
From my experience you need a better power supply.
When you start the miner there can be some high spikes when the gpu starts until it is regulated to the powertarget.
You might need to avoid this with a better power supply.
7 1070s take around 0.84 kw/h, add the cpu etc and you might be around 0.9 kw/h.
You only need a short spike of 20% to overload the power supply.
Better to buy 1.2 kw/h power supply or go down to 6 gpus.
Anyway for the best powerconsumption of the supply you should avoid to go over 80%.
not only that, but most PSU needs a different amount of "cooldown time" to discharge and reset the PSU to the normal (not faulted) state.... so the system simply isn't cutting all power to the PSU (hard-off via switch or cable unplugging) for long enough to let the other PSU come out of a fault setting.
Verify this next time with a multimeter; see where the fault arises; verify with what PSU (most likely the secondary psu).
FYI; do the math on what your PSU says it can supply amp-wise on the +12v line.... not the overall rating.
Next check to see if the 12V is split into two banks or sources; each will own have its own power limit normally (one being less than the other to feed the motherboard and CPU amperage for example).
Most people exceed one of the power limits thinking they are in the green. The Coolmax brand is NOTORIOUS for not saying what bank supplies power to what plugs. You can easily mistake that 110A of +12V on a 1600w PSU is an ok figure; but they niglect to tell you that 60A serves the PCIE power ports, and that the other 50A is for the SATA/Molex power connections, CPU and motherboard +12v. One of these PSU's could have burned down my house, and almost at the same time destroyed an expensive (back then) S7.When I emailed them asking if it was ok to pull 110A from the PCIE ports, they replied, "yes, it capable of supplying 110A to the PCIE power connectors"... I took it apart, and explained their miscommunication, and they immidiately backtracked and asked me to send a photo of the burned board to try and warranty it.... When they saw the burned daughter card; they said it wasn't covered and ignored every email from then on.... realizing after my third email telling them they are giving incorrect information on their label, and now. Take this as a learning lesson. Seriously. You don't know what really powers what sometimes unless you open it and follow the traces on the board.
Now;
Unless you are buying recent platinum rated PSU; always be safe and figure like this example:
It can supply 40A of +12v.
so 40*0.8=32A of safe usable power that you can use every 100% of AND have a margin of error.
0.8 is 80%, and if you want it in wattage: 32a*12v=384w
(E=I*R)
And as always, do not forget to be sure not to exceed the ratings on the power line feeding the PSU itself..
If buying platinum, I factor it at 85%. Just to be safe. Everything else I ritually go as per the above.
Also to finish @Juville: Don't use EWBF. read the last 10 pages of this thread.... please, for the love of god..... read them and you will understand my concerns.