Advantech TREK-668 Manual de usuario descargar pdf (Pagina 50)

TREK-668/303 User Manual 38

Low battery protection

To avoid draining out the car battery, low-battery protection is involved to ensure the

car battery is capable to start the vehicle. When the system is ON, the VPM controller

will monitor the car battery voltage. If the battery voltage is lower than a programma-

ble threshold (LOW_THRESHOLD), the VPM controller will go into LOW_DELAY

stage and start to count down. During the stage of LOW_DELAY countdown, if bat-

tery voltage is back above LOW_THRESHOLD, the VPM controller will stop counting

down and exit. If LOW_DELAY counts to zero, the VPM controller will send an event

(power button press) to notify the system, go into LOW_ HARD_DELAY stage and

start to count down. Once LOW_ HARD_DELAY counts to zero, the VPM controller

will cut off the system power abruptly to avoid draining out the car battery.

The table below lists the user programmable parameters for VPM features:

Default value Acceptable range

ON_DELAY 2 seconds 1 ~ 18000 seconds

OFF_EVENT_DELAY 5 seconds 1 ~ 18000 seconds

HARD_OFF_DELAY 60 seconds 1 ~ 18000 seconds

LOW_THRESHOLD (12V mode) 11.42 V 10.09 ~ 12.25 V

LOW_THRESHOLD (24V mode) 22.44 V 21.11 ~ 23.28 V

LOW_DELAY 30 seconds 1 ~ 3600 seconds

LOW_ HARD_DELAY 60 seconds 1 ~ 3600 seconds

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Advantech TREK-668 Manual de usuario Pagina 50