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LOOPSENSE EN54
INSTALLATION & COMMISSIONING
6.
Electrical
6.1
Primary Power Supply
The
LoopSense
Power Supply PCB combines the functions of;
A Mains to D.C. switched mode power supply unit that operates from a supply of; 204 - 264VAC @
47
– 63Hz supplying the system while all zones are in alarm
A battery charging and monitoring unit
A mains fail is detected when the PSU voltage drops below 24V.
6.1.1
Mains wiring
The requirement for the mains supply to the FACP is fixed wiring, using three core cable (no less
than 0.75mm
and no more than 2.5mm
) or a suitable three conductor system, fed from an
isolating switch fuse spur, fused at 3A. This should be secured from unauthorised operation and be
marked 'FIRE ALARM: DO NOT SWITCH OFF. The Mains supply must be exclusive to the FACP.
6.1.2
Connecting the Panel
Connecting
LoopSense
internal connections and PCBs is best undertaken immediately prior to
commissioning. Before beginning ensure all devices on the circuits are correctly connected and that
cable integrity is verified throughout the installation.
Important:
DO NOT use an insulation tester ('Megger') with any electronic devices
connected. Faults occurring in the wiring which are not picked up at this stage will almost certainly
result in spurious and intermittent faults when the equipment is energised.
Important:
Under no circumstances should the
LoopSense
panel be operated without the
Power Supply PCB correctly mounted in the enclosure and the retaining screws securely tightened.
6.1.3
Connecting the Mains
The technician should NOT attempt to connect Mains to the Panel until fully conversant with
the layout and features of the Power Supply PCB.
The incoming Mains cable should be brought into the Panel at the top right hand side of the
enclosure, fed through the ferrite core and correctly terminated on the Chassis Earth Terminal and
then to the Power Supply connector block.
Note:
Fuse F1 (2Amp (3A supply) or 1.25Amp (2A supply) / 250VAC M205) is field replaceable
Before switching on the Power Supply the Earth MUST be connected to the chassis earth terminal.
All earth cabling must be terminated to the Panel Chassis Earth Terminal in a Star
configuration.
The earth cable closest to the cabinet body must have an M4 SPW beneath the lug then an
M4 SPW and M4 nut.
Each additional earth cable must be terminated with an M4 SPW and M4 nut.
An additional M4 nut and M4SPW are fitted to the earth terminal for installers to connect the
mains earth
Chassis Earth Terminal
Earth Cable
Earth Cable
M4 Shake Proof Washer *
M4 Nut *
Note:
* Extra M4 Nut and M4 SPW are
provided finger tight on the Earth bolt.
Figure 4: Chassis Earth Terminal Connection
