Test Mode On The Control Panel - Siemens OOH740 Technical Manual

Maintenance / Repair
7
Testing the point detector

7.2.1 Test mode on the control panel

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Building Technologies
Fire Safety
The fire detectors are highly resistant to deceptive phenomena. This means that
optical fire detectors, for example, will recognize the immediate occurrence of
smoke (such as that which occurs during testing with test gas) as a deceptive
phenomenon and will not trigger an alarm. This is desirable in normal operation;
however, it does make testing with test gas problematical.
To enable detector testing with test gas or with a hot air fan, the detector must be
switched to test mode.
On an addressed detector line, the point detector or detector zones can be
switched to 'Test' on the control panel. Testing with test gas is then possible
without problems.
Collective operation
Collective control panels can be switched to test mode too. In this instance,
however, only the output of a real alarm is prevented. With collective control
panels, test mode has no influence over point detectors' response times.
The detector must be disconnected from the power supply on a collective detector
line such that it switches to test mode.
You can do the following to disconnect the power supply:
● Restart the detector line
● Remove from the detector base for at least 5 s the detector to be tested first in
a detector line and then reinsert it
The point detectors then have a reduced response time for 3 minutes.
To trigger a detector using test gas, normally 2...4 gas discharges at intervals of
approx. 2 seconds are required. When the detector is working in test mode,
activation takes place after approximately 10 seconds.
See also
2 Testing the point detector [➙ 95]
A6V10305793_m_en_--
2016-02-15