Time Dependencies; Function Test - Pfannenberg DS10-SIL Betriebsanleitung

4.6. Time dependencies

Tone
Operational voltage
Sounder channel
Operating voltage
Monitoring circuit
Alarm output
Fig. 8 Function time diagram
Tone
Operating voltage
Sounder channel
Operating voltage
Monitoring circuit
Alarm output
Fig. 9 Function time diagram with fault
4.7. Function test (Low Demand Mode)
For applications in 'low demand mode' with safety requirements an automatic function test should be carried out
with regular intervals. The test intervals can be seen in section 4.4.2.2 .
Both part systems, the sounder channel and the monitoring circuit, have separate power supply connections.
This means that a check of the function is possible and can be carried out as follows (time dependencies see
Fig. 8 and Fig. 9).
a) Switching on the monitoring power supply when the sounder channel is not activated, (can be omitted
depending on use if the monitoring is continuously connected to the supply)
b) Check whether the fault alarm relay has high-resistance >0.5s after switching on,
c) Switching on the sounder channel (sound is generated)
d) Check whether the fault alarm relay has switched after >0.2s (low-resistance)
e) Switching off the operational voltage of the sounder channel, the fault alarm relay must have fallen
away (high-resistance) after 2.5s at the latest
f) Switching off the monitoring (depending on use)
It is important for the system test that the change of the switch position of the alarm relay is detected depending
on the generation of the acoustic warning signal. With which distances a system test has to take place is de-
pendent on the eventual use in which the sounder is involved. The equipment specific check intervals must be
defined in the respective proof of safety.
The function test can be shortened if a tone without interrupted tones is used. Then time in point e) can be re-
duced to 0.3s.
It is required that a tone is selected at the DIP switch of the sounder or a tone is activated simultaneously with
the sounder from the 'external tone selection' option.
Datei/ file name:085501958h_D-GB-F-IT.docx
Tone is not generated
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* depending on the tone
for non-interrupted tones 0,2s
for long tone intervals up to
max. 2,5s
** valid only for the independent
ending of tones 26 and 98
Tone cancelled
* dependent on the tone
and cause of fault
Zeichnungsnr./ Drwg-no.: 30007-008-13h