User manual

105G Wireless Gateway User Manual
Elpro_man_105g_1.18.doc Page 32
Upon failure of the normal supply, the module may continue to operate for several hours from a
backup battery. The battery charger is designed for sealed or vented lead acid batteries between 5
and 24 amphours - other types of batteries should not be used. Typically, a 5 Ahr battery will
supply the 105G for 1 – 2 days, depending on the type of 105G.
On return of normal supply, the unit will recharge the battery. The maximum output of the
battery charger is 0.7A when the supply voltage is greater than 12V and 0.3A for less than 12V.
The 105G monitors the power supply and provides the following internal values, which can be
mapped as I/O values:
• Power failure (I/O Reg 4309) - if the supply voltage drops below 8V, this status value is set
on, and set off again when the voltage is more than 9V. For AC Supplies, this indicates low
voltage at approximately 10 VAC, and the status is cleared when the supply voltage rises
above approximately 12VAC
• Low battery voltage (I/O Reg 4308) - this status value is set on if the battery voltage drops to
11.3, and resets off when the battery voltage is more than 11.8V.
• Battery voltage value (I/O Reg 4310) - 8 – 40VDC corresponds to hex 4000 – hex C000.
• Supply voltage (I/O Reg 4311) - 8 – 40VDC corresponds to hex 4000 – hex C000.
3.3.3 Solar Supply
A 105G can be powered from a solar supply using an external regulator. If a 12V solar supply is
used, the 12V battery can be connected to the battery supply connections of the 105G and the
105G will monitor for low battery status and also battery voltage. If a 24V solar supply is used,
the 24V battery should be connected as a DC supply (SUP1 and GND) - the supply voltage can
be monitored however the “supply fail” voltage will activate too low to be used as a battery fail
status.