^wait - why did you arrange them like that? did you cross-link the power supplies to different units so that each is powered by both PSUs? looking at your stats/settings it looks like you set the max wattage to 240w/pcie, which will cause the hardware to start at about a 600W draw and quickly climb up towards a 950W draw. Obviously that will trigger the PSU to turn off

If your power is cheap, you can go to full specs (1600+GH/1100-1200W) using 2 PSUs/miner

or if you want to keep noise/heat down, you can use 1 PSU per SP20, and set your voltage around 0.64 and the wattage limits at 175W/loop to achieve about 1300GH/700W which can be cooled without excessive noise and heat