Praesideo 3.5 Installation and User Instructions 7 System Hardware Installation

en 303

controller. The standard EN 54-16 requires a minimum sound pressure level of 60 dB for the voice alarm condition and 50 dB for the fault warning condition, on 1 m distance, even with the door of the rack closed. The Praesideo PRS-NCO-B is delivered with a suitable buzzer for these purposes. This buzzer needs a power supply with backup. Although the system network supply could be used for this purpose, the power supply lines of the hybrid network cable are not easily accessible. Another option is to use the RS232 service-connection on the rear of the network controller. This connection is never used in an installed system, so it is possible to take advanrtage of its availability. An output voltage is available on pin 6 (DTR output) that switches between -9V and +9V, while pin 5 provides a GND connection. Using a high efficiency buzzer and a rectifier bridge, the RS232 connection can provide enough power to drive the buzzer to the required sound pressure level. Control outputs are located on short distance of the RS232 connector, to provide the switching information. See the wiring diagram in figure 32.5.

In this arrangement, the voltage between the RS232 DTR and GND connections is rectified and wired to the buzzer. The negative lead is interrupted by control outputs 3 and 4, connected in parallel, configured as follows:

•NCO_CO4 is enabled and configured as Fault alarm buzzer (by default, cannot be changed, see section 43.2.6)

•NCO_CO3 is enabled and configured as Emergency alarm buzzer (see section 43.2.6)

NCO_CO3 and NCO_CO4 are connected in parallel. The C-terminals of both control outputs are interconnected and the NO-terminal of NCO_CO3 is connected to the NC-terminal of NCO_CO4 to switch on the buzzer in case of an emergency alarm or fault alarm. The NC-terminal of NCO_CO4 is used instead of the NO-terminal because this control output is operated in an opposite mode for fail safe reasons. The unpowered (!) state represents the fault situation, as is the case for NCO_CO5, the fixed control output for the Fault alarm indicator.

figure 32.5: Connecting an alarm buzzer to the network controller

The buzzer supplied with the network controller is connected to an RS232 connector, with build-in rectifier bridge, by means of a 2 m long cable. This allows the buzzer to be positioned in the 19-inch rack, on such a location that the required audio levels are attained. The RS232 connector also provides a short control cable that can be connected to the NCO_CO3 and NCO_CO4 contacts, as shown in the figure.

Bosch Security Systems 2011-02

Page 302 Page 304
Page 303
Image 303
Bosch Appliances 3.5 manual Connecting an alarm buzzer to the network controller
Page 302 Page 304

3.5 specifications

Bosch Appliances has established itself as a leader in home technology, known for its commitment to quality, innovation, and sustainability. The Bosch 3.5 series epitomizes this ethos, offering a range of appliances designed to enhance everyday living while ensuring energy efficiency and ease of use.

At the heart of the Bosch 3.5 line is the integration of advanced technologies optimized for performance. One standout feature is the EcoSilence Drive, a brushless motor used in dishwashers and washing machines. This technology ensures quieter operation while offering reliability and energy savings. Customers can appreciate a peaceful home environment while benefiting from powerful cleaning options.

Another significant characteristic of Bosch appliances is their focus on precision and customization. The Bosch 3.5 series includes models with adjustable shelving and customizable interior layouts, allowing consumers to maximize storage according to their needs. The flexibility in functionality is complemented by features such as the VarioFlex and VarioDrawer systems in dishwashers, which offer additional loading options for better convenience.

Zones such as cooking and refrigeration have also seen remarkable improvements in the 3.5 series. The induction cooktops utilize speed and precision to deliver quick cooking experiences while maintaining safety, thanks to features like automatic shut-off and child lock. Furthermore, Bosch refrigerators included in this line employ innovative cooling technologies, such as the Dual Compressor system, which ensures optimal freshness for longer by preventing odor transfer between compartments.

Sustainability is a key characteristic of Bosch products. The 3.5 series appliances are designed to meet stringent energy efficiency standards, with many models Energy Star certified. This commitment to environmental stewardship resonates with eco-conscious consumers who seek to reduce their carbon footprint without sacrificing performance or style.

Aesthetically, Bosch appliances in the 3.5 line boast sleek designs that harmonize with modern kitchen aesthetics. With stainless steel finishes, multi-functional interfaces, and intuitive controls, these appliances not only perform exceptionally but also contribute to a sophisticated home environment.

In conclusion, Bosch Appliances 3.5 series integrates cutting-edge technology, sustainable practices, and user-centric designs, making them an optimal choice for modern households looking for reliability, efficiency, and style. Whether for cooking, cleaning, or preservation, Bosch continues to set the standard in home appliances.
Top Page Image Contents