Panasonic MEW01 351 Planning Manual page 139

Panasonic Electric Works Nordic AB
MEW01351 Rev: -
20.2.3.1
Planning Instructions Fire alarm system EBL512 G3, V1.1.x
Figure 28. Smoke algorithm N-15 for 4301, Heat algorithm
Class A1 for 3308 and Combined Decision algorithm Dec for
4300 respectively.
Detector: Shortening and Type number (e.g. OPT 4301 = Analog
photoelectric (optical) smoke detector, AHD 3308 = Analog heat
detector and AMD 4300 = Analog Multi Detector).
Name: Name of the algorithm (e.g. N-15, Class A1 & Decision).
Normally not changed.
Abbrevation: The algorithm abbreviation (< six characters) as shown
in the EBL512 G3 display, menu H4/U4 (e.g. N-15, A1 & Des).
Normally not changed.
Parameters for smoke algorithms
Offset is a fixed value added to the week average sensor value to get
the "alarm" level respectively, e.g. week average sensor value 1 +
offset 30 = 31 = the fire alarm level (equivalent to 3.1 % obscuration
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per meter).
The step value gives the alarm delay time to the algorithm
respectively, see chapter "Functions / Services / Features", page 89.
The following example is for the N-15 algorithm for the 4301
detector. The values for other algorithms and the 4300 detector are
different.
Offset, smouldering: Offset value, default 15 (1.5%/m).
Offset, pre-warning: Offset value, default 22 (2.2%/m).
Offset, alarm: Offset value, default 30 (3.0%/m).
Level, heavy smoke: Heavy smoke level, default 150 (15%/m).
Step value: Default 10.
NOTE! Changing these parameters will affect the sensitivity and
detection time and should be done by authorised personnel only!!!!!
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The week average value starts at "1" for a new (clean) detector. The very
first average value will be calculated within two minutes (after SSD
download & restart) and thereafter every week. The fire alarm level will be
adjusted or not adjusted every week, depending on if the latest calculated
week average value is the same as the previous, i.e. if it has increased or if it
has decreased. The week average value will normally increase very slowly in
a long-time period, due to contamination.
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