System Power, Internal Battery & Power Saving
Dualcom Mk1 requires a supply of 12-13.8 volts DC at 230mA in standby and
1.3 amps when activated. Transmissions taking this pulse of high current last
for 1/10 second. The power supply must be able to provide this current.
For Dualcom Mk1, a one amp power supply with standby battery is normally
sufficient to provide power. A non-fused output should always be used to pro-
vide power to communication devices. Where only fused outputs are available it
is recommended that a one amp ‘slow-blow’ type of fuse is fitted to accomodate
the short high-current requirements of Dualcom Mk1 when it transmits. Refer to
your power supply manual for fuse suitability.
Dualcom Mk2 requires a supply of 12-13.8 volts DC at 230mA in standby and
when activated. This current may rise to 450mA for several minutes when re-
charging the internal battery.
The installer must ensure that the Alarm System power supply is rated to
provide adequate power for this apparatus and for any other auxiliary appara-
tus drawing power from the Alarm System power supply(s). See Fig 18.
Only power supplies conforming to EN60950, EN41003 or International Safety
Standards should be used with this apparatus.
Where the Dualcom receives its power from a Power Supply that is ad-
ditional to the alarm system, ensure that the 0 volt connection on the
additional power supply is connected to the 0 volt connection on the
alarm system.
Dualcom Mk2 includes a power switch or jumper. Moving the Power Switch to
the Off position (or removing the Power Jumper Link) will disconnect the exter-
nal supply and the internal battery thus fully powering-down the Dualcom. See
Fig 2.
When transporting Dualcom ALWAYS disconnect the internal battery to
stop the battery operating the Dualcom until it is discharged.
DO NOT supply power to the Dualcom directly from the power supply /
control panel BATTERY terminals because this may bypass the current lim-
ited charging circuits found in many modern power supplies. This can result in
discharged power supply batteries and low battery indications being sent to the
ARC.
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