Installation & Service manual
VSS system
A100K10874
3
3. Installation
3. 1 Main Unit VSS-111
For physical dimensions, recommended panel cut-out, size of mounting holes etc. please see
mechanical drawing VSS-111_dd.
According to rules the system loudspeaker(s) should be installed so that incoming signals are
audible at all positions inside the bridge.
The reproduction of the sound signal inside the bridge is normally done by use of the VSS-111
built-in loudspeaker (8 ohm).
If more than one loudspeaker required the built-in one can be disconnected (P2) and
replacement loudspeakers can be connected. (total impedance = 8 ohm)
3.2. VSS-222 microphones
The efficiency of the system depends upon the microphone installation. The location of the
microphones outside the wheelhouse are critical due to ship speed, wind and vibrations.
Normally the microphones are mounted outside on each side of the bridge bulkhead or top plus
if wanted one in the bow and one aft.
Precautions:
* Mount the microphones leeward due to wind and the ship's speed.
* Do not mount the microphone too close to regularly opened doors or windows near
the operator panel and loudspeaker. This prevent the system to start oscilliating due to
acoustic feedback
* When the microphone bracket is fastened on the
bulkhead, let the cable do a one-turn service-loop before
entering the micro-phone housing. The loop will ensure
that the effect of the vibrations shock absorber is not
impaired. This is necessary to reduce ship-born vibrations
reaching the sensitive microphone elements.
NOTE!
The cable screen is connected to the
microphone housing.
In the operators panel (VSS-111) the
cable screens must all be proper
terminated to the chassis in the W/H
console.
Above is important to avoid noise
problems
The panel should of course be suitable
placed near the person operating it.
On the VSS-111 main PC board
Connect the microphone cables as shown in the figure.
1
2
3
4
P1
Screen
5
6
7
8
C1
C2
C3
C4
M
ic
ro
p
h
o
n
e
in
p
u
ts
Fore mic.
Aft mic.
Ps. mic.
Stb. mic.
All screens to chassis
in W/H console
A
B
A
B
A
B
A
B
