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Doc. Title
Author
Page of Pages
ST300/340 OPERATION MANUAL
– LATAM
HG.Park
131 of 146
Concerning
Doc. No.
Rev.
Date
Features and How to set parameters
1.41
26 May. 2015
Suntech International Ltd.
Confidential Document
9-3. Power Saving
The device can save power consumption of the battery by using one of two modes such as Sleep Mode or Deep
Sleep Mode. If
PWR_DN is set with ‘1’ or ‘2’ and report interval in parking mode is made every 10 minutes or
longer than 10 minutes to enable the devices to process power down while the vehicle is in parking situation.
However, there are some restrictions in processing power down:
-
If an emergency situation occurs, device cannot process power down for 30 minutes due to safety issue.
-
When GPS signal is not fixed, the device can start to process power down after trying to fix for 5 minutes.
-
If communication with the server fails continuously, the device processes Deep Sleep after trying to make
communications for 8 minutes.
-
While the device is in deep sleep, it cannot process charging the backup battery.
Device turns off LED and sends a status report and a related alert before entering the power-down functionality.
The device terminates power down either when ignition is ON or when an event or an emergency occurs. In such
cases, the device sends related alert and status string, instead.
- Sleep
Device turns off only GPS part and GPRS part enters Sleep. Even for time of Sleep, all communication with the
server works normally and the device can receive SMS or call always. Average of Sleep current is lower than 10mA
and this current may be increased under weak GPRS condition.
- Deep Sleep
Device turns off GPS and GPRS part. For the time of Sleep, all communication with the server is impossible and it
cannot receive any SMS messages or any calls, either. Device turns on GPRS session every max. 30 minutes.
However, the device cannot receive SMS or call while it is in Deep Sleep. Average current during Deep Sleep
mode is around 5mA (non-battery version).
9-4.Backup Battery
The device has a backup battery in order to be prepared for any emergency cases when the main power source is
removed or sabotaged. When the vehicle is stolen and power of device is removed, the backup battery starts
working as a replacement power source for the main power source (the vehicle
’s battery).
Backup battery at full charge on good GPRS network condition at a reporting interval value of every 3 minutes, the
device can work for 6 hours or more at least.
The device was designed to keep backup battery staying as effective as possible all the time. Charging the backup
battery starts if voltage of the backup battery goes below 4,2V.In a parking mode, charging the backup battery is
hold when the main power source gets consumed down to 90% of the normal voltage level.
The charging algorithm for the backup battery has a protection against over-voltage, abnormal charging current
and high temperature.
In addition, the device alerts about battery error if the backup battery cannot be charged.