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ANNEX 1: SNA 50-2 FUNCTIONING DESCRIPTION
A ) SYNOPTIC
Sensor
Line IN
B ) DETECTION
AND ERRORS MANAGEMENT
After initialization, the system is in its main operating mode in which it is testing systematicly various error sources. Errors
detected are as follows:
1 - Sensor link default.
Détection: if it exists a sensor link default.
- cut wire.
- hot point short circuit (ground).
- cold point short circuit (ground).
2 -
Failure level sensor. (The occurrence is stored)
At switching on, the test of sensor shows a problem in measurement chain. The pressure computed of this test is not
conform with that picked up at system specification.
C ) REGULATION :
1 - Instruction level
SNA 50-2 includes 4 independant instruction levels associated with 2 functioning types.
Closed/ open outside acess.
Night or Day period.
The combination of this configurations allows to regulator configurating automaticaly during day according to 4
modes following:
During daytime period and outside acess opening information is not active, the instruction level is "Leq day 1".
During daytime period and outside acess opening information is active, the instruction level is "Leq day 2".
During nightime period and outside acess opening information is not active, the instruction level is "Leq night 1".
During nightime period and outside acess opening information is active, the instruction level is "Leq night 2".
Note:
the instruction level evolves automaticaly during daytime.
AMIX
TEST
&
SENSOR
INFO
A or M Filter
Log / RMS
Converter
Sensor board
A or M Filter
Log / RMS
Converter
VCA
Regulation Board
DSP
A
Leq
Offset
D
computing
C
(1 and 10
Mn sliding)
Computer board
To AFF Series
To RJV 30
:
38
Open hood
Transfert demand RS232
External
information
Sensor port error
Window open
...
µC
To RS232 port
System
Management
µc Board
Regulation
Parameters
Regulation level
Output level
Attack time
Release time
LINE OUT
SNA 50-2
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