Technical / Programming Manual
FT128 Rev 2.2
119
14.20 Service Signal
A smoke detector becomes contaminated no matter what environment it is mounted in. In
a harsh environment, contamination is accelerated.
Conventional smoke detector: The sensitivity will normally increase in most environments.
This can result in nuisance alarms since conventional smoke detectors have a fixed fire
alarm level. Conventional smoke detectors have no service signal output and have to be
replaced on a regular basis (i.e. before being fully contaminated).
Analogue smoke detector: The sensitivity will automatically be constant
. Service signal
will be activated at a fixed service level. Service signal will be generated for 430x / 440x
in NORMAL mode when the week average sensor value is > 1.8 %/m. For detectors 440x
in Advanced mode, the service signal will be generated when the week average sensor
value is ≥ 2.0 %/m.
One or more detectors having activated SERVICE signal is indicated by the LED "Service"
on the CIE front. A programmable output can also be activated.
When a "dirty" detector has been replaced by a new/clean one, its week average sensor
value has to be set to default. This is done via menu H8/S4.
See also the FT128 Operation Manual chapter "Sensors activating SERVICE signal
(H4/U4)" and "Acknowledge SERVICE signal (H8/S4)".
14.21 Fault Signal (Fault Condition)
Fault signal, fault messages, fault acknowledge, etc. are described in FT128 Operation
Manual, chapter "Fault".
Programmable inputs can be used to activate fault signal in FT128, see chapter
Programmable Inputs, page 71.
For faults from zones and alarm points also the Alarm text (see below) will be shown.
14.22 Alarm Texts
The alarm texts are shown in case of a fire alarm.
The display in FT128: On the first row, the presentation number for an alarm point will
always be shown and on the second row, a user definable alarm text for this alarm point
will be shown, if programmed via EBLWin.
An example of fire alarm information:
ZONE-ADDR 12-45 LAST ZONE 12 No.01
User definable alarm text for 12-45
The Alert Annunciation units 1736 and the Ext. Presentation unit 1728: The same
information as in FT128 will be shown, if no other alarm text has been programmed, see
below.
Presentation number
When an alarm point is activated, both the zone number and the address (ZZ-AA) will be
shown.
When a Zone Line Input (e.g. on a 4580 board) is activated, only the zone number (ZZ) will
be shown.
See also FT128 Operation Manual, chapter "Fire alarm".
User definable alarm texts with up to 40 alphanumeric characters are created and
downloaded via EBLWin.
The detector is supervised at all times and adapts its fire alarm level in relation to the contamination of the detector, see
chapter “Week Average Sensor Value”, page 97.
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