Ampro Corporation COM 830 - Manual (Page 84)

Chapter 4 BIOS Setup Description
78 Reference Manual COM 830
Security Setup
Select the Security tab from the setup menu to enter the Security setup screen.
NOTE The term 'AC power loss' stands for the state when the module loses the standby
voltage on the 5V_SB pins. On modules, the standby voltage is continuously
monitored after the system is turned off. If within 30 seconds the standby voltage is
no longer detected, then this is considered an AC power loss condition. If the standby
voltage remains stable for 30 seconds, then it is assumed that the system was
switched off properly.
Inexpensive ATX power supplies often have problems with short AC power sags.
When using these ATX power supplies it is possible that the system turns off but does
not switch back on, even when the PS_ON# signal is asserted correctly by the
module. In this case, the internal circuitry of the ATX power supply has become
confused. Usually another AC power off/on cycle is necessary to recover from this
situation.