jotron MPA 1603 GA User Manual

14
User and Installaon Manual
Compact MPA
4 PERFORMANCE
4.1 GENERAL ALARM
The General Alarm tone in the Compact MPA system consists of seven short followed by one long tone burst. Each short tone
has approximately 1 sec. duraon, each pause between tones approximately 1 sec. and the long tone has 7 sec. duraon. The
alarm signal sequence is connuously repeated. The standard alarm tone is a 1000 Hz sinusoidal tone.
The General alarm tone can be adjusted by means of loading dierent conguraon data. Frequencies between 200 and
2500 Hz can be selected along with triangular or sinusoidal curve form. The conguraon changes require a special adminis-
trave tool and are unavailable during normal operaon.
4.2 FEEDBACK COUNTERMEASURES
In the Compact MPA system there are three dierent countermeasures available in order to avoid audible feedback and
disturbance during announcements.
The MPA 1601 Control Unit is equipped with either a gooseneck or handheld microphone with close-talk characteriscs with
excellent background noise suppression capability. It is equipped with relays for disconnecng loudspeakers in the close
proximity when acvated.
Each audio interface can be programmed to be of a recording type. The message is temporarily recorded and is automacally
played back when the announcement is terminated.
4.3 REDUNDANCY
In a PA/GA system like the Compact MPA the design and the installaon must be carried out in a way that the damage of one
single failure shall be minimized as far as possible. To achieve full redundancy using the Compact MPA system, follow these
measures:
4.3.1 CENTRAL EQUIPMENT
The Compact MPA cabinet must be duplicated and physically separated in dierent re zones – System A and B. Ref. picture
in chapter 1.
The A and B central equipment are connected together with a synchronisaon link to coordinate alarm tone generaon and
other ming-related funconality. If this synchronisaon link is somehow broken or damaged the systems will work individu-
ally.
The MPA 1601 Control Unit and MPA 1603 Alarm Panel are equipped with a duplicated interface for connecon to both sys-
tems (A and B). The connecon status is displayed in the System A / B led indicator of the MPA 1601.
4.3.2 LOUDSPEAKER DISTRBUTION NETWORK
The loudspeaker distribuon network must be duplicated and routed separately in dierent cable ducts and as physically
separated as possible.
All public areas shall be covered equally from both loudspeaker distribuon network.
All cabins shall be supplied with PA/GA loudspeakers. Minimum requirement is that neighbouring cabins shall be supplied
from dierent loudspeaker distribuon network.
4.3.3 ALARM PANEL
In order to have a required redundancy and availability to the General alarm, the minimum amount of MPA 1603 Alarm Pan-
els is two. One shall always be placed on the Navigaon Bridge. At least one more shall be placed in another strategic place
as an alternave acvaon posion.
4.3.4 CONTROL UNIT
In order to have a required redundancy and availability to the Emergency PA, the minimum amount of MPA 1601 Control
Units is two. One shall always be placed on the Navigaon Bridge. At least one more shall be placed in another strategic place
as an alternave acvaon posion. Addional units should be placed where it is deemed necessary.

jotron MPA 1603 GA Specifications

General

Brand	jotron
Model	MPA 1603 GA
Category	Marine Equipment
Language	English