Project Engineering; Application Conditions - Siemens FDCW221 Technical Manual

Project engineering

6 Project engineering
6.1

Application conditions

26
Building Technologies
Fire Safety & Security Systems
When planning a project, proceed as follows:
Measure the radio wave propagation (field strength measurement) in the
building with a suitable radio test set.
Plan the subdivision of the radio coverage area in different radio cells.
This information is required to plan the number and positioning of the radio
gateways.
Please adhere to the provisions in the applicable standards (e.g. fire sectors
according to EN54, local provisions, etc.) A radio gateway always corresponds to a
stub line.
see also:
6.4 Radio test set, Page 29
6.3 Defining the place of installation, Page 29
6.2 Transmission field, Page 27
Erroneous project planning of the operational conditions
Alarm signal not transmitted
Radio detection works insufficiently or not at all
WARNING Faults do occur
Perform a field strength measuring beforehand.
Adhere to the operational conditions and the chapters Installation location
and Transmission field.
The following operational conditions apply for the radio gateway:
The radio gateway must be at any time easily accessible for the service
personnel
Accessibility of operation elements (MC-Link connector, button, reed contact)
–
Battery replacement
–
The range between the radio gateway and the radio detector must be born in
mind (max. 40 m, depending on the field strength measuring)
The building construction has an essential impact on the radio transmission
range
Steel, concrete, thick or humid walls
–
Transmission field attenuation and reflection
Doors must be closed during the field strength measuring:
–
Mirrors in the room have a negative impact on the attenuation
–
Restrictions
The following application may possibly be unsuited:
Rooms with great attenuation of the transmission field, e.g. with metal grid
partition walls or metal storage shelves.
see also:
6.3 Defining the place of installation, Page 29
6.2 Transmission field, Page 27
009865_b_en_--.doc
11.2007