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• If the measured voltages are correct, but fault indication is still present, the detector
interface module must be exchanged.
• If the measured voltages are not correct compared with table 1, disconnect the
wires at the terminal nos. 33/34 at the detector interface module. Measure the
resistance between the disconnected wires and compare with the following table:
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
• If the measured values are not correct compared to table 2, disconnect the wires of
the zener barrier and measure the resistance of the zener barrier between terminal
nos. 4/5 and terminals nos. 1/8 ( 130 Ohm each path ).
• If the measured values are not correct, the zener barrier is defect.
• If the measured values are correct, the resistor - PCB must be defect. For
verification measure the resistance of the resistor - PCB betweeen terminal nos.
47/48 and compare with table 2, column no.3.
Fault Finding Instructions SDS26
Table 1a and 1b
Resistance
Values for line nos. 4 - 6 are corresponding
Table 2
Resistor-PCB at terminal
Ω
[
]
1044
1174
1357
1631
2087
3001
5741
∞
16.06.09
safetec
nos. 47/48
(without Zener Barrier)
Ω
[
]
784
914
1097
1371
1827
2741
5481
∞
Seite 5 von 13
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