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Fault Indication: "FAULT Airflow all lines" or "FAULT: Airflow Line -x-y-z-"
• Ensure one of the fans is running.
• Ensure 3-way-valves are open.
• Ensure upper door of the smoke detection panel / extension unit is closed.
• Ensure covers of the detector boxes are closed and screws of covers are tightened.
• Disconnect hoses at the smoke detection panel / extension unit to ensure airflow
through smoke detection panel / extension unit.
• Open the upper door of the smoke detection panel / extension unit and remove
cover of airflow indicator. Remove wire from terminal no.3 in the airflow indicator
and connect this wire together with the other wire to terminal no.1 (short circuit).
Now the fault indication of this line must disappear. If the fault indication
disappears, the airflow indicator must be exchanged. If the fault indication for this
line is still present, it must be an electrical problem, not a problem of the airflow.
For further examinations of the electrical wiring and components, please refer to
drawing no. BG01.720.4. Please note, that airflow indicators for line 1-3 are connected
to terminal nos. 33/34 and airflow indicators for line 4-6 are connected to terminal nos.
35/36 at the detector interface module.
• Check the wiring between resistor - PCB and appropriate zener barrier.
• Check the wiring between resistor - zener barrier and detector interface module.
• Measure the voltage between terminal nos. 34/18 and between terminal nos. 36/18
at the detector interface module. Both values must be 15V. These voltages are
supply for the multiplexed signals of the airflow indicators.
• Measure the voltage between terminal nos. 33/18 resp. 35/18 at the detector
interface module. These voltages are the output signals of the airflow indicators.
The values must be as follows:
Line 1-3
Situation:
Airflow is present
at the following
Line Nos.:
1, 2 and 3
2 and 3
1 and 3
3
1 and 2
2
1
No airflow
Fault Finding Instructions SDS26
Fault Finding of Airflow Faults
resulting Voltage
at Terminal Nos.
33/18 [V]
4,93
4,55
4,10
3,58
2,95
2,18
1,23
0
Line 4-6
Situation:
Airflow is present
at the following
Line Nos.:
4, 5 and 6
5 and 6
4 and 6
6
4 and 5
5
4
No airflow
16.06.09
safetec
resulting Voltage
at Terminal Nos.
35/18 [V]
4,93
4,55
4,10
3,58
2,95
2,18
1,23
0
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