Pre-Alarm
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AFP-300/AFP-400 Programming PN 50259:C1 06/19/97 37
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For example, if you program an ion detector for AL:7 and PA:5
(covered in "Selecting Detector Sensitivity" on page 22), an Alert Pre-Alarm occurs at
measured smoke detector levels that exceed 1.00% per foot obscuration. When the
smoke level of this detector exceeds 1.00% per foot obscuration, the panel sounder and
Pre-Alarm Warning LED pulse, and a panel display similar to the sample screen shown
in Figure 49 appears:
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If viewing the Pre-Alarm level of the same detector using the Read Status function, a
panel display similar to the sample screen in Figure 50 appears:
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If you program a detector for Action Pre-Alarm and the detector reaches a level that
exceeds the programmed Pre-Alarm level, the control panel indicates an Action
condition. Figure 51 shows a sample Action message that appears on the panel display
when a detector reaches an Action level. The control panel does the following functions
when a detector reaches the programmed Action level:
• The Pre-Alarm LED and panel sounder pulse until acknowledged.
• Zone F09 is activated—but Zone Z00 (general alarm) and the MPS-400 trouble and
alarm relays do not activate.
• The fifth zone programmed (not the first four) for this detector activates. The fifth
zone is the right-most entry on line two of the detector CBE in the point
programming screen (refer to the programming manual for detailed information).
This zone may be used to control functions of a detector or group of detectors on
Action level. Fifth zone activations also allow ACS annunciation by a detector or
group of detectors in Action Pre-Alarm condition.
• The Pre-Alarm condition and the zone programmed latch until System Reset, even
if the sensitivity drops below the Action level.
• A subsequent alarm condition for this detector clears the Action indication from
the panel display alarm list.
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