VDOT-ASD-400 Aspiration Detector
Velocity Detection
39
VDOT-ASD-400 Aspirating Smoke Detector User’s Manual V1
outcome of the scan will be shown on the display event log and the alarm relay on the Zone Relay
Board will be activated. The scan process example of a pipe 3 fire is shown on the following
illustration.
There’s possibility that the scan process is failed due to the result of smoke data calculation, no pipe
data is significant enough for the identification. In this case, the scan cycle will start again. If the
second scan cycle also failed, the scan will stop and no result will be generated.
o
Pipe Scan Function Settings
Item
Menu
Function
Le
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in
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o.
Mi
n.
Ma
x
De
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ult
Description
Auth.
19
Pipe Scan Enable
SE.
OFF
ON
OFF
Enable VDOT-ASD-400 Pipe Scan
Function
Mfg
Scan Level
SL.
0
4
0
The alarm level reached to start pipe
scan process to identify the pipe with
most smoke. 0=Manual Only, 1=Alert,
2=Action, 3=Fire 1, 4=Fire 2
Adm
Scan Time
St.
5
60
20
The time in seconds for the aspirator
operate on each pipe.
Adm
Note:
1.
Please goes to your local distributor for the manufacture level access code.
2.
The default settings for pipe scan is disable and scan level is manual scan only. To set the VDOT-
ASD-400 so it will scan automatically when alarm, both pipe scan and scan level should be set. For
example, if you want VDOT-ASD-400 automatically perform pipe scan when there’s an Alert
condition, set the pipe scan to Enable and scan level to 1.
Scan………………………......
Alarm
Pipe 1 Pipe 2 Pipe 3 Pipe 4 All
Identify
Output
Judging by the
smoke trend,
smoke is from
pipe 3.
Zone 3 Alarm
Status generated
(Zone 3 alarm relay
on the Zone Relay
Board activates, if
equipped)
Scan process starts and the fan on each pipe is
on and off in sequence to collect smoke levels
on each pipe.
VDOT-ASD-400
smoke level
increases and
generates alarms
(alarm relay on
the Terminal
Board activates)
