Advantech TREK-734, Руководство пользователя, Страница: 31 / 56

system hang. Aldo, once VPM controller enter the HARD_OFF_DELAY stage, the process cannot be
reversed.

Low power protection
To avoid draining power, low-power protection is to ensure that there is enough power
to start the machine. When the system is ON, the VPM controller will monitor the power voltage. If
the voltage is lower than the programmable threshold (LOW_THRESHOLD), the VPM controller will
start to countdown a delay(LOW_DELAY). During the stage of LOW_DELAY countdown, if voltage
goes back above LOW_THRESHOLD, the VPM controller will stop counting
down and exit.
If LOW_DELAY counts to zero, the VPM controller will trigger an power off event (i.e. power button
press) and starts to countdown next delay period (LOW_ HARD_DELAY). If LOW_ HARD_DELAY counts
to zero, the system power will be cut off abruptly to avoid draining the power.
4.2.4.2 Demonstration
You can set the delay and hard delay time of the low voltage event and ignition event.
Low Voltage Event

Delay:
The delay time before VPM trigger a power off event (i.e. power button press).

Hard Delay:
The delay time counted down after a power off event is triggered. VPM will force power off the
machine if the hard delay time is counted down to zero.
Ignition Event

On Delay:
The delay time before VPM trigger an power on event (power on the machine).

Off Delay:
The delay time before VPM trigger an power off event (i.e. power button press).

Hard Off Delay:
The delay time counted after an power off event is triggered. VPM will force power off the
machine if the hard delay time is counted down to zero.
Press “Save Default” to set current value as default value.
Press “Load Default” to load the stored default values.