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The Nextronic DNS-DVA system is a fully integrated Voice Alarm and Public Address unit, specifically

designed in compliance with BS5839 pt 8, to provide

simple and effective, life safety evacuation in buildings.

A distributed system uses the type DNS-DVA unit,

connected to a local, dual circuit, loudspeaker distribution. The unit is self contained and wall mounted,

incorporating all the elements of a single zone Voice Alarm system. The DNS-DVA module provides all the audio control, monitoring and dual circuit amplification for the Fire Zone. The unit also contains the main DC, battery backup and charging for the system.

The unit is extremely compact and lightweight, with

dimensions no larger than a standard Fire Detection panel. It is easily mountable on to a wall, without needing several people to lift it! Typically the DNS-DVA unit would be mounted next to a Fire Detection panel, and interfaced directly with locally monitored contacts.

The system can comprise of a single 'stand alone' unit, however this may easily be expanded into a large

distributed system, comprising many units connected via a data network. The system arrangement is of very high integrity, since each unit can operate as a Voice Alarm system, completely independent of other units in the

network. The serial data network between units provides global control, and ensures synchronization of Alarm broadcasts.

Unlike many other self-contained VA system units, this fully complies with the BS5839 pt8 requirements. The standard requires that there be two independently

amplified loudspeaker circuits, and also a hot standby amplifier, to automatically take over in case of fault.

Compact and lightweight design fits alongside standard Fire panels
Distributed system gives significant reductions in cabling costs
Easy to specify, install and maintain
Full compliance with BS 5839 pt 8 and BS EN 60849
Amplifier Capacity to drive up to 80 speakers at 100v line
Cost effective solution for single zone evacuation, and fully scalable
Very low power consumption using Class 'D' Amplifiers
End of Line monitoring suited to all Loudspeaker types
Upto 16 Digital Message playback
Integral Fire Microphone and Loudspeaker
LCD System Status Display, Fault History Log and code-locked Keypad

Retail Units
Office Blocks
Factories and Warehouses
Theatres and Cinemas
Hotels
Schools
Railway Stations
Extensions to existing systems

Amplifier Protection Thermal, Over-voltage, Over-load
Processor monitoring Watchdog clock, memory check sum, and failsafe relay
Fault Monitoring Fully monitored to BS5839 pt 8
Fault Output Contacts Urgent and Non-urgent (volt-free)
Aux Output Contacts 2 (System Busy, and user defined)
Serial Communications Dual circuit multi-drop (RS 485)
Status Indications 4 (Healthy, Busy, Main Signal and BGM signal present)
Audible Indicators 1 (Buzzer sounds on any new fault)
User Controls (Fascia) Fault Accept, Fault Reset, BGM Vol
Local User Controls Evacuate, Alert, Clear, Test, Cancel, Tick tone, Fault Accept, Fault Reset, Mic select
Monitored Contact I/ps 3 (Evac, Alert, Test), and 1x Cancel
UPS Monitors Main supply, Charger and Battery
Battery & Charger Test Disconnect / monitor test every 30s
Loudspeaker Monitors End Of Line test every 30s

Compliance BS 5839 parts 1 & 4 & 8: 1998
Overall Dimension 360 x 500 x 150 mm (w x h x d)
Power supply Mains 230V AC nominal +/-10%
Standby Supply 5VA (on mains failure)
Loudspeaker Outputs 2 ch
Selective Audio Inputs 2
Failsafe Audio Inputs 1 (bypass on processor failure)
Microphone Level Inputs 1 (via fascia panel)
Background Music Input Stereo (with user volume control)
User Display (fascia) 32 character backlit LCD
Data Entry Code-locked, 12 way keypad
Digital Messages Upto 16 (pre-programmed)
Digital Audio 8kHz bandwidth ( 60sec total)
Amplifier Power Output 80w (configured as 40w + 40w)
Standby Amplifier 40w Monitored with auto-c/o