2 acc off, 1 boot-up, 2 switch to backup power – IEI Integration TANK-800-D525 v1.14 User Manual
Page 56: Figure 3-37: acc off: at mode, Figure 3-38: acc off: atx mode
TANK-800 Embedded System
Page 44
3.9.2 ACC OFF
When the TANK-800 is in ACC Off mode, the main power input is Power 2 connector and
the backup power is from Power 1 connector.
3.9.2.1 Boot-up
When both power connectors are connected to power source with over 9 V power input,
the two power LEDs on the front panel turn on. The user can choose to use AT power
mode or ATX power mode to control the system. The following flow diagrams show the
boot-up process and the LED status in AT and ATX power modes.
Figure 3-37: ACC Off: AT Mode
Figure 3-38: ACC Off: ATX Mode
3.9.2.2 Switch to Backup Power
During the operation, the system power will switch 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.