Brooks Firetracker FT420, Техническое руководство

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Technical Manual
FT420
– Iss 2.4
68
4.4.2 Alarm Post Delay Facility Option
The feature is normally used in the Fire Fan Control applications where a duct detector is fitted in the
supply air duct. If the Alarm Post Delay feature was enabled for a zone (i.e. check box under that
column has a tick), and if a smoke detector in that zone was in alarm, the zone will latch the alarm
condition. When the smoke clears up in the smoke detector, the zone will remain in alarm for another
30 - 60 seconds before the zone alarm condition resets (post timing).
To enable this feature,
check the “Alarm Post Delay” check boxes for the desired zones.
4.4.3 Alarm Non-latching (Auto-Reset) Option
When the “Alarm Not-Latching” option is selected for a zone, this zone will automatically reset once
the smoke in a smoke detector within this zone clears up i.e. auto-reset. Similarly when a heat
detector in a zone goes into alarm, this zone latches in alarm condition until the temperate decreases
below the alarm threshold. Then the detector resets as well as the zone in alarm.
To select non latching mode,
check the “Alarm Non-Latching” check box for each zone required to be
non-latched.
To check all boxes for
“Alarm Non-Latching” against all zones, choose “Set the Feature To all”, select
“Reset the Feature to All” to uncheck all boxes.
A non-latching zone is normally used as a tone alert trigger input in Alertcom or a fan control duct
probe input.
The Alarm Non-Latching feature has precedence over the Alarm Post Delay and the two are
interlocked. Therefore, if any check box under the Alarm Non-Latching has a tick, the corresponding
Alarm Post Delay check box for that zone will automatically be disabled (i.e. check box un-ticked) and
vice a versa. Both these columns cannot be enabled simultaneously.
4.4.4 Alarm on Short Circuit Option
When this option is selected, a short circuit in the zone input will generate an alarm instead of fault.
To select this feature,
check the boxes against the desired zones under the column heading “Alarm on
Short Circuit’.
To check all boxes for “Alarm on Short Circuit” against all zones, choose “Set the Feature To all”,
s
elect “Reset the Feature to All” to uncheck all boxes.
4.4.5 Alarm Non-DBA
If the Non DBA option is selected for a zone, an alarm in this zone will be treated as a Non-Brigade
Alarm. The common alarm relay will not activate and the Brigade Tx LED will not flash, any other
general alarm function will operate as a normal DBA zone.
If the OWS is fitted, the non-DBA zone will trigger the alert tone / message for approximately 3 minutes
then activate the T3 evacuation tone / message.
To check all boxes for “Alarm Non-DBA” against all zones, choose “Set the Feature To all”, select
“Reset the Feature to All” to uncheck all boxes.