jotron MPA 1600, Руководство пользователя и инструкция по установке, Страница: 49 / 62

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User and Installation Manual
Compact MPA
8.4.7 FAILURE / WARNING OUTPUTS
There are two dry closing contacts voltage for indication of failure and warning conditions:
Power failure:
• Primary and Secondary mains power supply missing
• Backup power missing
Pass/Fail
General warning:
• No communication with user panel Pass/Fail
8.4.8 REDUNDANCY TEST (DUPLICATED SYSTEM ONLY)
Remove power from “A” system. Ensure all alarms and paging operates satisfactorily on the “B” system.
Restore power on “A” system.
Pass/Fail
Remove power from “B” system. Ensure all alarms and paging operates satisfactorily on the “A” system.
Restore power on “B” system.
Pass/Fail
8.4.9 SOUND PRESSURE LEVEL
The major requirement of a GA / PA system is sufficient coverage and sound pressure level (SPL) for alarms and PA messages
to be heard throughout the installation.
The general alarm requirement are 80dBA and at least 10dBA above the ambient noise level in interior and exterior spaces. In
sleeping positions and cabin bathrooms the requirement is a minimum of 75dBA and at least 10dBA above the ambient noise
level.
Public address requrements in interior spaces, including sleeping positions and cabin bathrooms are 75 dBA and at least
20 dBA above ambient noise level. In exterior spaces the sound level should be atleast 80 dBA and at least 15 dBA above
ambient noise level.
In no cases should the sound level exceed 120 dBA.
To ensure this, the MPA 1600 system makes use of the industrial standardized 100 V line distribution system. This is a
distribution system that is based on a fixed line level (100V) and where the loudspeaker output power is determined by
means of loudspeaker type and power tapping. Hence, each loudspeaker meeting this line specification is equipped with an
audio transformer with several tapping possibilities.
The sound pressure level in an installation is a site dependant issue, and is determined by the amount, type and tapping of
the loudspeakers.
An installation must be carefully planned to ensure sufficient SPL figures
In order to approve or decline a GA / PA system installation a full SPL-figure survey must take place subsequent to the
installation and setting-to-work process.