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4. Battery
The battery is supervised in two different ways. The first "low battery voltage indication" is activated
when the battery voltage is too low for any reason. The second is a "battery fault alarm" activated
when the battery capacity is too low and it is time to replace the battery.
In case there is a battery alarm/low battery voltage indication, the GSM Gateway will change the dial
tone; see section Technical Data for information on Dial tone battery alarm specifications. The
emergency alarm will detect the new dial tone and send a battery alarm to the receiver. See section 5
SMS functionality or 6.2 Setup for information on how to turn the Dial tone battery alarm off.
4.1 Low battery voltage indication
A "low battery voltage indication" is activated if the battery voltage drops below 4.6 VDC when the unit
is powered by the battery.
The indication is sent by SMS. Please view SMS functionality for information on settings or how to use
the USB connector and FältCom Manager Software.
If the unit is powered by the battery and the battery voltage drops below 4.0 VDC the GSM Gateway
will shut off to prevent permanent damage of the battery. These voltage levels are not programmable.
4.2 Battery fault alarm
A "battery fault alarm" is shown by a red LED, see section 2 above, and by a change of the normal dial
tone, see section 5.2 below.
The first battery test is made after 48 hours and the following every 24 hour. During a battery test a
(1)
load is connected to the battery and the battery voltage measured. A battery test lasts for 5
minutes
VDC during this time a "battery fault alarm" is activated.
(2)
and if the voltage drops below 4.4
A battery test will not be performed when the GSM Gateway is powered by the battery. An active
"battery fault alarm" is automatically reset after a passed battery test.
Normally the battery will last 2-4 years but this is very much depending on the surrounding
temperature and how much the battery is used. When the battery is failing, simply replace the battery
with an equivalent type, replacement batteries are available from FältCom sales. Other types of
battery might damage the GSM Gateway.
A polyswitch fuse is integrated in the battery package to prevent it from damage in case of high
temperatures. The fuse is automatically reset when the temperature is normal again.
(1) 5 minutes is the default setting. The time is programmable via USB (FältCom Manager).
(2) 4.4 V is the default setting. The levels for the "battery fault alarm" is programmable via USB
(FältCom Manager) or via SMS by the distributor.
162236M User Manual GSM Gateway
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