Incite Fire ASD 532, Operating Manual

Page: 26 / 121

Function
26 / 121
2.2.13 Autolearning
With the Autolearning function the ASD 532 is able to monitor the ambient air over a defined period of time (adjustable from
one minute to 14 days) via the sampling pipe and send the results to the system; based on that it can then determine the ideal
trigger threshold of the smoke sensors. This prevents operational disturbance variables such as dust, vapour and smoke from
triggering false alarms on the ASD 532. It means it is also possible to set a highly sensitive trigger threshold (far below the
trigger threshold requirements of EN 54-20), for example for clean rooms. During
Autolearning the biggest amplitude of the
smoke sensors is determined and then multiplied by an adjustable factor of 1.1 to 10 to define the final trigger threshold. The
finally determined trigger threshold, however, can never be less than the minimum possible trigger threshold (depending on
the smoke sensor type, see example 2) and not greater than the trigger threshold for fulfilling the EN 54-20 requirement (see
example 3). If the day/night control is activated, the values for both time periods are determined separately.
Example 1:
•
Smoke sensor type = SSD 532-2 (0.1–10%/m)
•
Required trigger threshold as per system limit and “ASD PipeFlow” for EN 54-20, Class C = 0.4 %/m
•
Selected Autolearning factor = 2
•
Maximum amplitude (smoke level) during Autolearning = 31%/m
Calculation: 0.31 x 2 x 0.4 %/m = 0.248 %/m
Result: Trigger threshold of the smoke sensor =
0.248%/m
Example 2:
•
Smoke sensor type = SSD 532-3 (0.02–10%/m)
•
Required trigger threshold as per system limit and “ASD PipeFlow” for EN 54-20, Class A = 0.03%/m
•
Selected Autolearning factor = 1.1
•
Maximum amplitude (smoke level) during Autolearning = 50 %/m
Calculation: 0.5 x 1.1 x 0.03 %/m = 0.0165 %/m
Result: Trigger threshold of the smoke sensor =
0.02%/m (minimum possible trigger threshold of the SSD 532-3)
Example 3:
•
Smoke sensor type = SSD 532-2 (0.1–10%/m)
•
Required trigger threshold as per system limit and “ASD PipeFlow” for EN 54-20, Class C = 0.2%/m
•
Selected Autolearning factor = 10
•
Maximum amplitude (smoke level) during Autolearning = 16%/m
Calculation: 0.16 x 10 x 0.2%/m = 0.32%/m
Result: Trigger threshold of the smoke sensor
remains at 0.2%/m and thereby fulfils the EN 54-20 Class C requirement.
Notice
•
Norm-compliant alarm release during Autolearning is guaranteed; the procedure is interrupted. Likewise,
Autolearning is aborted if during the procedure a change in the configuration takes place (change among the
switch settings A11 – C31 , W01 – W44 and X01 – X03 ). If there is a power interruption on the ASD (supply line)
during Autolearning , it will be restarted once the supply voltage is restored. In the event of a disablement (trig-
gered from the FACP or using “Reset External”), Autolearning is interrupted and then re-started after re-
activation.
•
Autolearning can only be used with the “ASD Config” configuration software and in switch positions X01 –
X03 .
•
During Autolearning both the point (watchdog display) and the AL text flash on the segment display.
ASD532 Operating Manual