User guide

UPC-V312-D525 Panel PC
Page 48
Figure 3-39: ACC Off: AT Mode
Figure 3-40: ACC Off: ATX Mode
3.8.2.2 Switch to Backup Power
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 3-41: ACC Off: Switch Between PWR1 and PWR2