Function Test (Starting Alarm); Process Safety Time; Proof Test - Pfannenberg DS5-SIL Instructions De Service

4.8. Function test (starting alarm)

The algorithm, as described in section 4.7, must be carried out immediately before every time the machine is
switched on.
Note: in doing so the functionality of the monitoring channel (diagnosis channel) is tested according to the
IEC61508 required frequency.

4.9. Process safety time

Conclusions for the required process safety time can be drawn depending on use according to the function time
diagrams. The reaction times for the generation of the acoustic warning signal and the switching status of the
alarm relay depending on the switching on and off time of the operational voltage (Fig. 8) and in the case of a
fault (despite demand, the warning signal is not generated, Fig. 9) are illustrated here.
With the connection of the operational voltage, the sounder generates an acoustic warning signal after 0.3s at
the latest and reports this via the alarm relay (output low-resistance). This means the 'generation of a warning
signal' safety function has been activated. Further explanations of the reaction times of the alarm relay can be
found in section 0.

4.10. Proof Test

Manual checks of the safety function and the visual condition of the sounder are to be performed in regular in-
tervals. This test serves to identify dangerous faults that are not automatically detected and the general condi-
tion of the device. If the proof test is not carried out in the required, defined, timely intervals this leads to the loss
of the reachable SIL evaluation. The sequence of the carrying out of the individual test steps of the proof test is
arbitrary. The 'proof test' is to be carried out as follows:
Test Test step
Visual check a.) Housing
b.) Horn outlet
c.) Cable screw joint
Electronic d.) manual function
test
function
e.) Electrical isolation
Acoustic f.) Tone
function
g.) Tone option TAS
h.) Noise level check
Logging i.) Log of the test
results
Datei/ file name:085501958e.docx
Test instructions
mechanical damage, corrosion damage, attachment to the location
not covered or locked
tight fit, seal for the cable guaranteed
- manual, step-by-step deployment of the individual test steps as described
in section 0 under use of one of the following tones: 88, 90, 92, 100, 108,
112, 116, 117 (Important – interrupted sound with intervals >0.5s!, recom-
mended tone no. 117), adjust respective tone with DIP switch
- Check of the respective switching status of the alarm relay of the monitor-
ing circuit with check of the specified max. switching times (< 0.2s sound
on, < 2.5s sound off, see also Fig. 8)
- acoustic check whether a sound is generated upon request
Check the isolation between the alarm relay output and connection of the
operational voltage supply of the monitoring channel. Also, the connections
to X3 should be disconnected. The connection X3 contact 3(4) to contact
5(6) is to be checked with a current flow check. This must be high-
resistance (>1MΩ).
Acoustic check of the tone pattern of the locally used tone. This can take
place subjectively by trained personnel. The pattern (intervals, frequency
response curve, frequency change, interval times) is to be checked as
shown in the tone table in section 3.5. The person must be capable of iden-
tifying the warning signal. Alternatively, technical implements suitable for
this test can be used. The signal can be taken oscillographically for analy-
sis with a microphone and preamplifier or electronically from PIN13 of the
integrated switch U4 (earth connection to the heat sink of the U3 switching
circuit, TTL level).
The test step 'f.) Tone' must be repeated for every additionally activated
tones in the application when using the 'external tone selection' option.
Noise level measurement or subjective assessment of the noise level by a
representative group of people during a test release under max. ambient
noise level. The noise level must be more than +10dB above the max.
ambient noise level or be clearly recognisable by this group of people. The
tone in the system is to be used. Alternatively, a noise level measurement
can be taken in an anechoic room or under open-air conditions. In this
case, for tone no. 57, a noise level of at least the rated sound level -3dB(A)
must be reached with a metre distance.
must comply with the rules for functional safety according to IEC/EN61508
Seite / page: 30 / 52 Zeichnungsnr./ Drwg-no.: 30007-008-13e