Blocking Functions - Siemens XC1003-A Operation

Structure and function
4.2.3

Blocking functions

14
Building Technologies
Fire Safety & Security Products
If yet another detector of the detector zones detects a fire outbreak in the
extinguishing area (one detector from each of zones 1 and 2) or if the manual
release button is activated (zone 4), the control unit goes over to the "Activated"
state. The alarm horn changes from slow to a pulsating tone. During the pre-
warning time all people must evacuate the area to be flooded. The activated time
can be set to between 5 and 60 seconds.
After expiry of the activated time the releasing element (actuator) is triggered and
the flooding time begins. At the same time the illuminated warning panel is
activated, and the alarm horn changes from pulsating to a continuous tone. After
several seconds, the pressure switch at the cylinder bank reports ejection of
extinguishing agent. From this point on, the alarm horn can be silenced. The
system can be reset only after completion of the flooding time. The flooding time
can be set to between 30 and 120 seconds.
The fire control (shut off air conditioning, smoke protection flaps and doors to the
extinguishing area) is triggered as a rule in the case of "Fire alarm" or at the start of
activated time. After resetting the system, the fire control will be enabled again. As
soon as extinguishing is finished, an authorized person can reset the building
systems to normal mode again.
The extinguishing control unit can be equipped with different blocking devices as
described below.
Emergency hold button
The Emergency hold button is used for temporary stopping the extinguishing
initiated during the activated time.
During the activated time, people can evacuate the room to be flooded. When the
hold button is pressed, the activated time is suspended and the alarm horn
changes its tonality. When the hold button is released, the activated time is
restarted.
Emergency abort button
The Emergency abort button is used for canceling the initiated extinguishing
during the activated time.
During the activated time, pressing the abort button cancels the initiated
extinguishing and the alarm horn changes its tonality. The system remains in this
operating state until reset. After reset, the system remains blocked until the
mechanical locking of the abort button is cleared by an authorized person.
When not in activated time, the abort button is used for blocking the automatic and
manual activation of extinguishing.
Mechanical blocking device
The mechanical blocking device is used for blocking the activation of extinguishing
during maintenance work. As a rule it is used in CO
cannot be influenced by the extinguishing control unit. The mechanical blocking
device can be set to "closed" or "open" mostly by turning a lever. The "closed"
position is shown on the extinguishing control unit. If the mechanical blocking
device is in neither the "closed" nor the "open" position, the extinguishing control
unit reports a "Fault" of the mechanical blocking device.
-extinguishing systems and
2
A6V10099835_a_en
12.2007