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Page 6
ZONESENSE DH4
OPERATORS MANUAL
4.7
Power Supplies and AC Mains Installation
4.7.1 Primary Power Supply
The FACP consists of the Main Control Card and mains transformer. The control board is broken
into two sections, the main control circuitry and the power supply / charger.
4.7.2 Mains
wiring
The requirement for the Mains supply to the FACP is fixed wiring, using three core cable (no less
than 0.75mm
²
and no more than 2.5mm
²
) 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.
4.7.3 Connecting the Panel
Connecting
ZoneSense – DH4
internal connections and boards 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
ZoneSense PLUS - AR
panel be operated
without the Power Supply correctly mounted in the enclosure and the retaining screws securely
tightened.
4.7.4 Connecting the Mains Earth
All earth cabling shall be terminated to the panel Chassis Earth Terminal in a star configuration.
The earth cable closest to the cabinet body shall have an M4 SPW beneath the lug then an M4 SPW
and M4 nut.
Each additional earth cable shall be terminated with an M4 SPW and M4 nut.
An additional M4 nut and M4 SPW are fitted to the Chassis Earth Terminal for installers to connect
their Mains Earth.
M4 Shake Proof Washer
M4 Shake Proof Washer
CHASSIS EARTH TERMINAL
M4 Nut
Earth Cable
Earth Cable
M4 Nut
M4 Shake Proof Washer *
M4 Nut *
Note:
* Extra M4 Nut and M4 SPW are
provided finger tight on the Earth bolt.
Figure 3: Panel Earthing
4.7.5 Connecting the Mains Power to the Mains Transformer
CAB2875
TO EARTH
OUTPUT OF
TERMINAL
FUSE
BLOCK
MAINS
TRANS-
FORMER
NEUTRAL EARTH LIVE
FUSE = 0.5A
M205
Figure 4: Mains Transformer Wiring