Apollo 45681-705 Краткое руководство по эксплуатации - Страница 2
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The low volume range is useful in areas such as
hospitals where a fire alert is initially intended
to warn staff only. The sounder is set to the high
range for general use.
Synchronisation of tones ensures the integrity
of the signal—tones from different sounders
do not merge into one signal that could be mis-
taken for a different tone.
Group addressing is a simple method of alerting
an entire area or group of rooms without delay.
For systems requiring isolators at every point
the built-in isolator saves installation time and
cost.
The acoustic self-test means that the sounder
listens to itself when it is switched on. If no
sound is detected a fault signal is transmitted
when the sounder is polled.
The VAD self test is achieved by means of an
LED monitoring circuit. If the LEDs do not draw
current when the Sounder VAD Base has been
switched on a fault signal is transmitted when
the device is next polled.
ELECTRICAL CONSIDERATIONS
The Sounder VAD Base is loop-powered
powered so needs no external power supply. It
operates at 17–28V DC and is polarity-sensitive.
TONE FREQUENCY AND VOLUME CONTROL
The tone frequency of the sounders, together
with sound pressure levels, is published in
a separate document, PP2203 available from
Apollo.
ADDRESSING
The XP95 Sounder VAD Base responds to its
own individual address set with a DIL switch.
It also responds both to a group address, set
by means of a 4-segment DIL switch and to a
synchronisation address which is embedded in
the unit.
Addresses 1 to 111 are used exclusively for
individual addresses; addresses 112 to 126 are
used for group addressing. Any Sounder VAD
Bases on a loop may be freely assigned to a
group. The address for any group must be
chosen from the range 112–126.
Addresses 112–126 may be used as individual
addresses but only if the 4-segment DIL switch
is not used ie, group addressing is disabled.
If the 4-segment DIL switch were set to any
number other than the default 127, a pre-set
analogue value of 4 would be transmitted to
indicate a fault.
The XP95 Sounder VAD Bases are normally
polled by the individual address. If more than
one Sounder VAD Base is activated it is possible
for the sounders to be synchronised with each
other.
GROUP ADDRESSING
It may be desirable, in alarm conditions, to
switch more than one Sounder VAD Base
simultaneously. To enable this, devices may be
controlled as a group and given a group address
which is common to all Sounder VAD Bases in
the group. When a device recognises its group
address, it will process the output bits but it will
not return any data to the control panel on that
address. If it is required to confirm the status
of the outputs of devices under group address
control, it is necessary to interrogate all devices
in the group at their individual addresses.
SELF TEST
An important safety feature has been
incorporated into the Sounder VAD Bases:
when it is switched on it tests itself by checking
the actual sound output and flash operation. If
no sound is detected within 5 seconds of the
Sounder VAD Bases being switched on it will
transmit an analogue value of 1 (= sounder fault)
when it is next polled. If no current is drawn by
the LEDs an analogue value of 2 (= VAD fault) is
transmitted. If neither element is operating an
analogue value of 3 (= Sounder and VAD fault)
is transmitted on the next polling.
This feature can also be used during
commissioning or periodical maintenance
testing. Simply activate the Sounder VAD for at
least 5 seconds and check the control panel for
a fault signal. If none is received, the Sounder
VAD Base is working properly.
PROTOCOL COMPATIBILITY
The Sounder VAD Bases will operate only with
compatible control equipment using the Apollo
XP95 or Discovery protocol. The features of
the Sounder VAD Base are available only when
it is connected to a control panel with the
appropriate software.