EN 54-2 : 7.8
If an EN54-2 monitored
fire alarm routing
output is required an
unmonitored relay is
not suitable - use a monitored routing
997-274-000-6, Issue 6
ID3000 Series Installation & Commissioning Manual
7.4.5 24V Auxiliary Outputs Check
There are two monitored 24V Auxiliary Outputs. Before
connecting any circuit to either of these outputs check that:
a. The external wiring is not short circuit.
b. There are no forward-biased diodes (as used for
When connecting to the output, observe correct polarity!
7.4.6 Sounder Circuit Outputs
The sounder cicuits are designed to work either with a
resistor end-of-line (EOL) device (default) or, to comply with
the requirements for partial shorts and open monitoring
of EN54-13 (Compatibility Assessment of System
Components), where a diode EOL device is required. If
resistor EOL devices are to be used follow the first procedure
described below. If diode EOL devices are to be used refer
to the procedure described overleaf.
220.127.116.11 Using Resistor EOL Devices
Before the sounder circuits are connected it is
recommended that all detection circuits have been
checked and that there is no possibility of spurious alarm
conditions being generated. The sounders should be
polarized and suppressed using IN4002 (or similar)
diodes and the circuits should be fitted with the 4k7 end-
of-line resistors. Ensure that a jumper link is fitted to
JP11(see at left). Perform the following checks:
1 Use a low-voltage multimeter to check the resistance
Note: If this Base PCB is replacing the earlier version
2 If electronic sounders are used this test will not reveal
3 When the sounder circuits have been connected, the
example with end-of line power monitoring relays)
connected across the external wiring.
across each of the sounder circuits:
With the meter connected in reverse polarity (+ve
to '-ve' and -ve to '+ve') the reading should be 4k7.
ii. With the multimeter connected to the circuit in normal
polarity (+ve to '+ve' and -ve to '-ve') the meter may
indicate a lower value. This is because of the forward-
biased diodes in series with the sounders.
(PN:124-301) ensure that the wiring is reversed.
reversed devices. It is, therefore, recommended that if the
circuit resistance appears correct, the following be done:
Remove the 4k7 resistors from the panel outputs.
ii. Connect the circuit to the panel output while
observing correct polarity.
iii. Using a multimeter, measure the voltage across
each sounder output circuit (as shown at left).
The normal voltage reading should be between
5V and 8V. If any devices are reversed, a reading
of between 1V and 2V will be indicated.
sounders may be tested using the 'END DELAY/