VESDA by Xtralis
VESDA VLC-400 Product Guide
www.xtralis.com
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8.7
AutoLearn
AutoLearn is the process of monitoring the average smoke obscuration levels in and environment in order to
set the most appropriate early warning alarm thresholds.
Caution:
Before using AutoLearn it is essential that the protected area is operating under normal
conditions. For example, all building work should be completed and the air conditioning
operational.
While AutoLearn is running, the detector is fully functional, operating with the alarm thresholds as set at the
time AutoLearn started.
If a Fire condition is detected during AutoLearn then an “AutoLearn aborted” fault is reported (Fault 27). If the
AutoLearn function is aborted all modes return to their Pre AutoLearn setting
When AutoLearn is finished all 5 modes are updated with the AutoLearn result. Alternative threshold may be
configured manually once AutoLearn is complete.
8.7.1
Using AutoLearn
The AutoLearn function is started from Xtralis VSC by selecting the “Start AutoLearn Smoke” tab from the
device menu. From this form (refer to Figure 8-2) you can set the duration of Autolearn (upto a maximum of 14
days). Click <start> to begin and the VESDA VLC-400 will respond by continually blinking the OK LED with
three flashes while Autolearn is in progress.
Figure 8-2: AutoLearn Option
The Fault LED on the detector remains ON while the RS232 cable is connected and Xtralis VSC is active. At
the same time the panel sees the detector as being in a fault condition until the program and socket are
removed.
While AutoLearn is running, the detector is fully functional, operating with the alarm thresholds as set at the
time AutoLearn was started.
If a Fire condition is detected during AutoLearn then an “AutoLearn aborted” fault is reported (Fault 27). If the
AutoLearn function is aborted all modes return to their pre-AutoLearn settings.
When AutoLearn is finished all modes are updated and the OK LED is returns to a steady ON condition.
