2 switch to backup power, Figure 3-41: acc off: at mode, Figure 3-42: acc off: atx mode – IEI Integration UPC-V315-QM77 User Manual

Page 59: Figure 3-43: acc off: switch between pwr1 and pwr2

UP C-V315-QM77 P a n e l P C

P a g e 48

Figure 3-41: ACC Off: AT Mode

Figure 3-42: ACC Off: ATX Mode

3.8.2.2 S witc h to Ba c ku p P o we r

During operation, system power switches from Power 2 to Power 1 automatically when the

following situations occur:

 Power 2 < 10.5V and Power 1 > 9V

 Power 2 is unplugged and Power 1 > 9V

The following flow diagram shows how the power is switched between Power 2 and

Power 1 and their LED statuses.

Figure 3-43: ACC Off: Switch Between PWR1 and PWR2