Structure and function
Function
3
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Building Technologies
A6V10305793_m_en_--
Fire Safety
2016-02-15
Operating the point detector OOH740 in collective mode:
Once the point detector has been inserted into the detector base or once the
detector line has been reset, the point detector works in test mode for a period of
3 minutes.
The 'Test mode' status is displayed on the point detector's internal alarm indicator.
The internal alarm indicator displays the parameter set selected at the present
moment.
During this time, the point detector's response time is considerably reduced. This
makes it easier to test the point detector with test gas.
See also
2
Internal alarm indicator in the case of ES <20 (OOH740 and
2
Setting the parameter set in collective operation [
2
3.3.11 Behavior in degraded mode
Applicable for the C-NET:
When the main processor of the fire control panel fails, the control panel works in
degraded mode operation. Depending on the control panel type, the fire control
panel can continue to perform the most important alarming and signaling functions
in degraded mode operation.
Behavior of control panels that support degraded mode operation:
Alarming is still ensured in degraded mode operation. However, in degraded mode
only collective alarming is possible. This means that in the event of an alarm, it is
possible to identify the C-NET detector line but not the exact location of the
detector triggering the alarm.
●
If a sounder base DBS720 is connected to the output for the external alarm
indicator, it is activated in degraded mode operation in the event of a fire alarm.
●
When the connection for the external alarm indicator is used for a control
function (e.g. hold-open system), the output assumes the configured fail-safe
position; configuration for a specific control panel is possible.
In degraded mode operation, the OOHC740 only supports the 'Fire' alarm class. If
the 'CO' alarm class is also to be supported in degraded mode operation, please
contact technical customer support.
Degraded mode operation on the C-NET is not supported in the same way by all
control panels. The information in the 'List of compatibility' and in the corresponding
control panel documentation must be taken into account during project planning.
Degraded mode operation is not possible on collective detector lines.
