1.5 Power Supply Module
The Power Supply is situated beneath the main chassis of the control unit and provides the power
for the whole system. The power supply is a standard item and does not require any
modifications regardless of the type and quantity of detector heads being used.
There are three power source options available to the system:
1. 220-240V AC Mains Supply Switch Selectable
2. 110-120V AC Mains Supply Switch Selectable
3. 24V DC Supply No switch position change required
Options 1 & 2 are easily selected via an on board switch (sited beneath a yellow protective
cover). Option 3 is provided as an alternative to an AC mains supply and allows the use of an
external 24V DC power supply (connected via the Distribution Board).
There are four fuses situated on the power supply PCB. These are:
FS1 (T1.0A) Mains Fuse
FS2 (T2.0A) Internal 24V Supply
FS3 (F1.0A) 24V to Outputs 1 – 3
FS4 (F2.0A) Internal/External Battery (see Note below).
Note:
The internal batteries will supply power to the system as soon as FS4 is fitted. However, an
external power source will be selected once connected to the system and the internal batteries
will charge. The internal batteries will not provide backup if FS4 is not fitted or it has blown.
The power supply provides the charging current for the internal standby batteries such that in the
event of an external power failure, the system will continue to operate for sufficient time to allow
reconnection of the external supply. The backup time provided is dependent upon:
1. Quantity and type of Detector Heads used
2. Time since last Mains power fail and duration of power fail
3. Alarm status, and other external loads placed upon system
Refer to section 1.6 for further details.
The system will automatically select the internal batteries in the event of the external AC/DC
supply failing and will reselect the external supply on its reconnection. If it is necessary to
disconnect all power to the system, mains power should be removed followed by the removal of
fuse FS4.
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