
TWINFLEX
®
pro² Control Panel Engineering and Commissioning Manual
8
Power Supply Unit
The mains supply should be dedicated to the Fire Alarm Panel and should be clearly labelled ‘FIRE
ALARM: DO NOT SWITCH OFF’ at all isolation points. The Fire Alarm Panel 230V AC supply requires
a 3 amp
un-switched fused spur
with local isolation and fixed wiring between 0.75 mm
2
and 2.5 mm
2
,
terminated into the fused terminals provided in the back box. The main PCB is supplied via a Switch
Mode Power Supply located below the vented cover. Only the power supply provided in the unit may be
used to power the control panel. Both mains termination and location of power supply are shown below.
The control panel requires standby batteries
2 x 12V 3.2Ah (or 3.4Ah)
sealed lead acid batteries
should be installed according to the following diagram. These are to be sited in the control panel back
box using the provided clamps. The batteries should be connected in series using the connection leads
supplied. See the section entitled
Control Panel Connections
for panel connections.
Note that the charging circuit will be in its high impedance state (approximately 3V DC) if no batteries,
faulty batteries, or only one battery is connected. The full 27V DC (nominal) charging voltage should be
present if the correct batteries are connected.
If the system shows a charger or battery fault on first power up, leave the system to charge the batteries
for 5-6 hours.
In order to test for correct operation of the batteries, remove the mains 230V AC fuse and allow the
batteries to settle from their charging voltage for approximately 5 minutes. The battery voltage should
then be measured using an electronic test meter and a voltage greater than 24V DC should be seen.
Note that batteries are electrically live at all times and great care should be taken to ensure that the
terminals are never presented with a short circuit. Care should be taken at all times, especially during
transit, installation and normal use.
Batteries no longer required should be disposed of in a safe and environmentally friendly manner by the
manufacturer or a suitable recycling service. They should never be incinerated or placed in normal
rubbish collection facilities.
230V AC supply
Switch Mode
Power Supply
location
www.acornfiresecurity.com
www.acornfiresecurity.com