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Evacuation
systems and power failure requirements....
Praesideo
main components such as the network controller and power amplifiers
have a primary input voltage of 90 to 264 Volts AC, 50-60Hz.
In the event of primary mains failure a battery backup system
should be used. Praesideo has secondary power supply input of
48Volts DC with an operating range of 45 to 56Volts DC.
Click on
the links for more information:
Powerfail requirements for BS EN IEC 608849 >>
Praesideo battery back-up solutions from NTE
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Powerfail
requirements for BS EN IEC 608849
If the building
is to be evacuated following primary power failure, a secondary
power supply shall be provided. This shall be capable of operating
the system in the emergency mode for a period equal to twice
the evacuation time determined by the appropriate authority
for the building. In any event, the secondary power supply shall
be capable of powering the system for a minimum of 30 minutes.
If the building is not to be evacuated following failure of
the principal power supply, the secondary power supply shall
be capable of operating the system for at least 24 hours, or
6 hours if an emergency generator is available, and then powering
the system in emergency mode for a minimum of 30 minutes. If
a building remains unoccupied for several days, provission should
be made to ensure that the voice alarm system is capable of
operation in emergency mode for 30 minutes when the building
is reoccupied.
Non-emergency functions within the system, such as background
music, shall not operate from the secondary power supply if
this will reduce the capacity for emergency operation. Praesideo
has the facility from software version 1.1 for the BGM to be
deactivated.
If batteries are used
as a secondary power supply they shall be of the secondary type,
complete with automatic charging facilities. Where lead-acid
batteries are used they shall be of the valve-regulated type
unless otherwise specified, and the charging system shall incorporate
charging current compensation for changes in the ambient temperature,
where this is necessary to achieve the specified battery life.
Batteries shall be
used in accordance with the manufacturers recommendations in
order to achieve their specified life, which shall not be less
than 4 years. The end of life shall be taken as the time when
the deterioration to less than 80% of the rated ampere-hour
capacity (at the one-hour rate) has occurred.
Automatic charging
shall ensure that the batteries are fully charged to 80% of
their maximum rated capacity from the fully discharged state
in a period of not more than 24 hours.
Adequate ventilation
and protection against corrosion and dangers resulting from
gases emitted by the batteries shall be provided.
Please note that
the above requirements are the responsibility of the installer
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Praesideo
battery back-up solutions from NTE
NTE can design and
supply a battery backup solution for Bosch Praesideo and other
competitive evacuation systems.
The rectifier /
charger unit is supplied with the following specification:
- On/Off indicator
- Output with double pole fused to suit the load
- Battery Voltmeter
- Charge Ammeter
- Charge fail indicator
- Single Pole Changeover - to indicate a mains or charge failure
via a special contact
- 110/120 or 220/240 Volts AC mains single phase supply
- 54 Volt float potential
- Housed in a single or multiple cabinets depending on the
load required
- Batteries supplied to BS6290 part 4 specification, 10 year
life and flame retardant.
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For more information
about Bosch Praesideo voice evacuation systems and our battery
back-up solutions please do not hesitate to contact
us directly. Or if you know which part you are looking
for, please complete our quotation
request form and our Bosch team will respond to your
enquiry immediately.
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NTE Limited,
1 Faraday Road, Peterlee, Co Durham, SR8 5AP. Registered in
England no. 3451873
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