Pag. 18
Technical
STARTING UP THE INSTALLATION
Before starting up the installation, it is always a good idea to check that all the wires are correctly connected as shown
in the corresponding diagram.
Make sure that the power supplies are suitable for the building’s power supply.
The power supply Ref. 88302 function at any voltage between 85 and 270 Vac, but have a programming jumper to set the
appropriate voltage. Make sure that this is set correctly (see the instructions of the apparatus).
If there is an audio problem in any (or all) the telephones, we advise you to check that the problem is not with the
installation by connecting one of the telephones that is not working directly to the amplifier (terminals 1,2,3 and 6 of the
amplifier to 1,2,3 and 6 of the telephone). If it works then the problem is in the installation, almost certainly due to a lack
of sections in the cables used (see gauge table below).
If it is a visual problem in a video door phone installation, you can
see if it is working properly using the test connector incorporated
in the telecamera.
If the visual problem no longer exists then you can reject any
problem with the equipment.
TABLE OF SECTIONS NECCESSARY DEPENDING ON THE LENGHT OF CABLE
In video doorphone installations over long distances it is neccessary to add a video signal amplifier ref. 4110
every 250 mts.
The most common problems that are encountered are the following:
The monitor does not light up when there is a call , although the call is heard
When a call is made to the monitor, the LED indicator, which is normally on, should be off all the time that the image is
on screen.
If the LED goes out but there is no image, follow the CT signal that leaves the monitor and is used to activate the
telecamera and all of the distributors through which the video signal passes. It is possible that the CT cable is cut or badly
connected somewhere. If the CT signal is okay, check that the video coaxial is correctly connected to all of the
distributors, at the same time making sure that there is no short circuit in the coaxial between live and mesh anywhere
in the installation.
The maximum number of monitors that can be on at the same time is six. If they call a lot of monitors at the same time,
the power supply cuts off automatically as a protection against overloads. It connects itself again automatically a few
minutes later.
The image is of poor quality
Make sure that the 75 ohm charge resistors have been cut out in all the distributors except the last one. See installation
diagrams.
Make sure there are no more than six monitors connected at the same time.
Make sure there is no contact between the live and mesh of the coaxial anywhere in the installation.
To solve any problem contact FERMAX’s Technical Department on 96 3783413, or our extensive Technical Assistance
Service network where we will be pleased to help in any way.
DISTANCES 0-300m 300-500m
500-1000m 1000-1500m 1500-2000m
1 mm
2
1.5 mm
2
2.5 mm
2
1.5 mm
2
2.5 mm
2
4 mm
2
0.5 mm
2
1 mm
2
1 mm
2
1 mm
2
fine lines in the diagrams
thick lines in the diagrams
