DP-PSUEN EN54-4 Fire Alarm Power Supply Series –INSTALLATION & OPERATION MANUAL
DP-PSUEN Series Installation & Operation Manual Rev 11.1 220323.docx E&OE
- 8 -
When a final sighting for the power supply has been decided it is highly recommended that the 20mm knockouts
that are going to be used are removed before fitting the box by a sharp tap with a hammer and flat bladed
screwdriver at the edge of the knockout. Separate knockout holes should be used for AC power entry and low
voltage wiring and the wiring kept apart. The knockout holes are designed to accept cable glands.
The power supplies should not be mounted near sources of heat or moisture and should be accessible for ease of
fitting heavy batteries.
The printed circuit assembly will have to be removed from the medium sized enclosure before mounting. This is
done by pushing the four light pipes towards the lid until they unclip, removing the earth lead by pulling the earth
connector off the tab and unscrewing the four board securing screws. The printed circuit assembly can then be
removed before mounting.
The keyhole slot at the top of the enclosure may be used as a first fix to hang the unit where the bottom two holes
can be marked off when level and then removed for drilling. Using the enclosure directly as a drilling template
should not be done as it risks dust damage.
Care should be taken when refitting the board using the shake proof washers and ensuring they are tight to make
good electrical contact with the printed circuit board and the metal base. The light pipes can then be clipped back
into place and that they are positioned over the LEDs. The earth cable can then be pushed back on to the
connector tab.
5.2 AC POWER CONNECTION AND WIRING
AC power with a protective earth for Class 1 equipment is to be used with an isolating switched spur using the
recommended fuse ratings or a fuse rating of not greater than 5A. The fused switched spur should be fitted as
close to the power supply as practicable to allow isolation when the unit is serviced. AC power cable with
conductors of a cross sectional area greater than 0.75mm should be used.
The AC power cables shall be segregated from the low voltage control wiring and outputs to load. 20mm diameter
knockouts on the four sides of the box are provided for cable glands including mineral insulated copper-clad cable.
Where batteries are fitted, the knockouts at the bottom of the box will not be available.
To comply with EN54 requirements both AC power and low voltage wiring must use cable glands to meet IP30
enclosure protection standards.
5.3 JUMPER LINKS
NB: WARNING: The AC power supply and the batteries must be disconnected before the jumper
positions can be changed. Failure to do so can cause damage to the PSU, batteries and connected
equipment.
The power supply must not be used with the INT jumper in the off position without a DP-PSUEN
external temperature sensor fitted, as this could result in a battery fire or explosion risk.
The NO BAT link must be in the off position to comply with EN54-4 requirements.
Three jumper links are provided for configuring the PSU, the “off” position is when the jumper is “parked” on a
single pin and the “on” position is when the jumper is placed across two pins:
