System Power, Internal Battery & Power Saving (continued)
Dualcom Mk2 includes an internal battery that ensures continued reporting
and monitoring (typically 2 hours with a fully charged internal battery) even in
the event of a total power failure to the Dualcom Mk2. This battery also provides
the higher current that Dualcom requires when it is transmitting. This battery is
disconnected when Dualcom is supplied. Connect the battery during installa-
tion and allow it to charge for a few minutes before use. See Fig 2.
Note: The internal battery provides improved performance and reliabliity.
It does NOT replace Control Panel or PSU standby batteries.
On Dualcom Mk2, when power is re-applied after a power failure or during instal-
lation, the internal battery will be recharged. If the internal battery is completely
discharged the Dualcom supply current may rise to 450mA for a short period. A
completely discharged internal battery will normally recharge within 20 hours.
The supply (internal battery and external PSU) will be automatically tested with
a short duration high current load every hour. If the supply fails this test a low-
battery signal will be transmitted to the Alarm Receiving Centre.
Dualcom includes some advanced power saving features. In the event of total
power failure to Dualcom, the unit will continue to operate on its internal battery.
Total power failure to Dualcom will be signalled to the ARC as a battery fault 10
minutes after it occurs. This delay avoids unnecessary reporting during installa-
tion. Thereafter the Dualcom will go to low-power mode.
Low-power mode following a power supply failure is indicated by the Red and
Green signal strength LEDs both pulsing On and Off once per second.
Low-power mode will inhibit the hourly load checks on the internal battery and
reduce the current required by Dualcom from 230mA to about 30mA. Low-
power mode allows the unit to operate for longer on the remaining battery power.
When power is restored above 12.0 volts the low-power mode is terminated and
the normal-power mode is re-established.
Power Supply or
Control Panel
Dualcom with
internal battery
Fig 18
31
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