VESDA VESDA-E VEP-A00, Product Manual

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VESDA-E VEP-A00-P Product Guide
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5.5.5 Smoke Threshold Options
The Smoke Threshold options provide the mechanism to set the smoke obscuration trigger point for each
alarm level, and the ability to assign day or night thresholds to cater for different levels of activity in the
protected area during these times.
Refer to Section 5.6 for the default settings.
Figure 5-16: Smoke Threshold Options
The Smoke Threshold configuration options are as follows:
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Day Thresholds: The settings for day time smoke thresholds. The threshold and the delay are used
together to decide when to trigger the alarm condition.
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Night Thresholds: The settings for night time smoke thresholds. The threshold and the delay are used
together to decide when to trigger the alarm condition.
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Delay: The length of time between the alarm threshold being reached and the relay operation
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Cumulative Delay: If checked the delay timer for each alarm condition will not start until both the
smoke level has exceeded the threshold and the delay timer for the previous alarm condition has
expired. If not checked the delay timer for each alarm condition will start immediately when the
smoke level exceeds the threshold.
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Instant Fire: If checked, the Fire 1 time delay is ignored when the smoke exceeds the Fire 1
threshold before the Alert and Action conditions have occurred.
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Significant Smoke Change - Logging: The smoke change level at which an event is recorded in the
Event Log.
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Significant Smoke Change - VESDAnet: The smoke change level at which a smoke status update is
output on VESDAnet.
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Changeover:
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Work Days: Select which days use both day and night thresholds. Night time thresholds are used if
a day is not selected.
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Day / Night Changeover Time: The settings for the timing of the threshold changeover.
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Holidays: The settings used to define a holiday period. Use the dropdown calendars to choose the
start and end times of the holiday (or break) period. Night time thresholds are used during the holiday
period.