Signal Processing - Siemens FDL241-9 Technical Manual

Information displayed on the
detector exchanger and tester
Any fault message
2
3.3.6
Building Technologies
Fire Safety
Meaning
Invalid parameter settings
Reflection
Invalid initialization
Supply error
Software error (Watchdog error)
Memory error
Communication error involving detector and
control panel
The information displayed on the detector exchanger and tester and intelligent
1
detector tester is always in English; no translation into the country language.
This status can be displayed together with another status, e.g. 'needed excha.'
2
(replacement necessary).
You will find more information in documents 007227 and 009718.
See also
 Applicable documents [➙ 9]
 Repair [➙ 81]

Signal processing

The signal processing of the detector efficiently distinguishes between fire events
and deceptive phenomena. The basis for reaching a danger level is not only given
by measurements below a certain response threshold; moreover, the smoke
density progression is observed over a longer period of time and evaluated with
ASAtechnology (ASA = Advanced Signal Analysis). The detector processes the
signal according to internal diagnoses and reports the result to the control panel.
Correction value
The compensation value is the reference value for the current signal. All response
thresholds and evaluations are based on the current compensation value.
The first compensation value is defined during initialization. The compensation
value is updated approximately every 60 minutes to compensate for any slow
signal drifting. This drift may be caused by dirt on the detector, for example.
The current compensation value is saved in a non-volatile memory every 23 hours
and is not lost in a power cut.
The compensation value can be a minimum of 50 % of the compensation value
during initialization.
Standardized signal value
The standardized signal value is the signal value (as a percentage) of the current
compensation value. If the signal value is the same as the compensation value, the
standardized signal value is 100 %. The standardized signal value is displayed on
the adjustment device.
Structure and function
Measures
Set valid parameters
Remove or cover reflecting objects
Re-initialize detector
Check voltage of detector line

Replace detector

Replace detector
Replace detector
Remedy cause
3
Function
27
007016_i_en_--
2012-09-07