EQUIPMENT:
FIRE
CLASS
PRECEPT EN
PUBLICATION:
FIRECLASS PREC EN INST
ISSUE No. & DATE:
3 13/09/18
PAGE 17 of 30
terminals at this stage. Remember to remove
any links fitted to detector bases. Be very careful
to maintain correct polarity at each device.
Warning: Intrinsically safe zone arrangement.
End-of-line capacitors cannot be connected
to
zones
monitoring
Intrinsically
Safe
detection devices in hazardous areas. To do
so will risk causing an explosion in the
hazardous area. End-of-line resistors with a
value of 3K9
Ω must be used, which comply
with the requirements laid down in the
installation data sheets provided with the I.S.
barrier and the I.S. fire detection devices.
In
order
for
detector
head
removal
monitoring to function correctly when
resistors are used as the end-of-line devices,
any diodes in the detector bases that are in
circuit when the detector head is removed
must be disconnected.
The panel must be configured to monitor
Intrinsically Safe zones.
The first device on an Intrinsically Safe zone
must be an I.S. Zener Barrier or Galvanic
Isolator. Detectors and Manual Call Points on
the Safe side of the barrier are not permitted.
To comply with the requirements of BS5839,
all manual call points should be located in
the
zone
cabling
between
the
I.S.
Barrier/Isolator and the first detector. Any
manual call point or detector located on the
“end-of-line” side of a detector will be
rendered inoperative if the detector head is
removed.
12.5
Powering up
1. Prior to powering up, the panel will have been
installed in accordance with the installation
instructions, all cabling will have been fully
installed and tested, glanded into the panel
enclosure but not connected to the panel
terminals. The mains supply should be isolated
externally to the panel.
2. Check the battery connections are correct.
3. Remove the mains supply fuse from the panel
mains terminal block. Once the permit to
energise the mains supply is in place, energise
the mains and check the voltage and polarity are
correct before replacing the panel fuse.
4. The panel will power up and if all the end of line
devices are correctly terminated in the panel and
the battery is OK, the panel should be silent,
displaying only the Power Supply On indication.
5. Turn the Access Keyswitch
to “1” and press the
Test Display button. The panel should respond
by lighting all indications and sounding the
buzzer. This will continue for a few seconds after
the button is released.
12.6
Configuration
12.6.1 Basic Default Configuration
When first powered up, the Precept EN can be
operated in the standard default mode without any
additional configuration.
The basic default mode is:
All zones latching fire, non-delay, standard [non-
intrinsically safe]
Fire Routing, Fire Protection and Sounder
outputs not delayed.
12.6.2 Site-Specific Configuration
It is possible to tailor the functionality of the Precept
EN fire alarm panel in line with site-specific
requirements. Details of the site configurable
options and the configuration process are provided
in section 15.1. Charts are provided in the System
Log Book for planning/recording the actual
configuration. This configuration is not lost when
the panel is powered down.
12.7
Commissioning Procedure
After completion of the pre-commissioning wiring
check, power-up and configuration, commission the
circuits in line with the following guide.
12.7.1 Alarm Circuits
1. Remove the resistor from the first alarm circuit
terminal and connect the first alarm circuit wiring
to the terminals, observing correct polarity.
Check that any alarm fault indications clear after
a few seconds.
2. Use the Alarm Test facility [see Precept EN User
Manual] or press Evacuate to operate the
sounders. Check that all sounders connected to
the alarm circuit operate.
3. Deselect the Alarms Test condition or if
“Evacuate” was used, press silence alarms to
stop the sounders operating.
4. Repeat steps 1 to 3 for the second and any
subsequent alarm circuits.
12.7.2 Zones
1. Work logically and systematically through each
zone.
2. Zone fault conditions:
o
Remove the end-of-line device from the zone 1
terminals and connect the cables of the zone 1
circuit to the panel terminals, observing the
correct polarity. Check that any zone 1 fault
indications clear after a few seconds.
o
Check the fault monitoring of the cable is
correct by applying an open circuit then a short
circuit at the end-of-line device (in the field).
Check that the fault condition is indicated on
zone 1 on the fire panel.
