Maintenance And Service; Preventive Maintenance - Bosch PRAESENSA Installation Manual

PRAESENSA
19

Maintenance and service

The PRAESENSA system requires minimum maintenance. To keep the system in good
condition, see the following sections.
19.1

Preventive maintenance

Cleaning
Wipe clean only with a dry or damp cloth.
Notice!
Do not use alcohol, ammonia or petroleum solvents or abrasive cleaners to clean the devices.
Depending on the pollution degree in the operating environment, check at regular intervals
that the air inlets for ventilation on the front side of the rack mount devices are not obstructed
by dust. Use a dry cloth or a vacuum cleaner to remove dust.
Operate devices within specifications
When designing the PRAESENSA system, Bosch largely avoided using wear parts. The parts
subject to wear and tear are dimensioned to last longer than the lifetime of the products when
they are operated normally. Operate the devices within their specifications.
Relays and fans are electromechanical components and are subject to natural wear. The relays
in the amplifiers are used for spare channel switching and loudspeaker group A and B
switching in case of failures. During normal operation the relays are hardly ever switched and
the relays have a very long lifetime. The fans in the amplifiers and multifunction power
supplies are temperature controlled and run on low speed most of the time, minimizing wear.
Battery replacement
The system controller has an internal lithium coin cell battery, model CR2032 (3 V, 225 mAh),
in a battery holder. It is only used to power the internal real time clock (RTC) when the system
controller is off. The life‑time of the battery is in that case more than 20 years. When the
system controller is on, the RTC is powered from the external power supply and the CR2032
battery is not used, making the system insusceptible to spring contact bounce of the battery
holder in case of heavy vibrations.
See also Internal battery, page 60.
Software updates
Bosch continually works on improving and developing the software. Regularly check whether
there is a new version of the software that provides additional benefits. Information and
software downloads are available on the Bosch PRAESENSA product pages on the internet
(www.boschsecurity.com).
Regular maintenance
Regularly (e.g. twice per year, or following local legislation) check the correct operation of the
complete system, especially when the system is used as voice alarm system only without
regular announcements or background music in the zones.
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Bosch Security Systems B.V.
Check for changes in room occupation, requiring different sound settings or loudspeaker
positioning.
Check for changes of the environmental conditions and update the system if needed.
Use the Diagnose section of the configuration webpages to:
Installation manual
Maintenance and service | en 181
2019.11 | V1.00 |