MT VCC 01
35
MT VCC 01
GENERAL INSTRUCTIONS FOR INSTALLATION,
TESTING AND OPERATION
The systems
The systems that can be implemented are: video intercom systems with one or more
external units, with or without call-up of the image on the monitor (Autostart).
Intercommunicating video intercom systems with call-up of the image on the monitor
(Autostart).
Autostart is recommended for systems with up to a maximum of 4 users.
Refer to product catalogue 07 for a complete list of the products and accessories for
traditional wiring.
The
Comelit Group
can implement any special type of video intercom system at the
request of the customer.
In this case, the client must provide all the information possible, especially the func-
tions of the system and the distances involved.
Cable ducts and conductors
The links of the equipment may be visible or located inside appropriately arranged
cable ducts.
It is good practice for the conductors for the video intercom system not to be inserted
inside tubes containing other conductors with high voltages and powers, in order to
avoid the possibility of annoying noises in the audio and disturbances on the monitor.
Two types of conductor have been indicated in the diagrams, some with thin and bold
lines according to the function.
The sections to be used according to the distance are specified in the following table:
Beyond 100 metres it is essential to use the VCC/PF variant on page 65 to avoid
voltage drops in the electric locking circuit.
Transport and distribution of the video signal
The video signal is transported by low-loss coaxial cables with an impedance of
75 ohms (see RG 59U cable) for a maximum distance of 300 m.
For longer distances, add the video amplifier/corrector and synchronisms Art. 4374 to
be installed approximately half-way along the distance.
The connection diagram is supplied with the equipment. For distribution of the video
signal, the shunt Art. 4555/A is used, which allows shunting for 4 monitors directly
from the upright column. Unused outputs must remain open.
The last shunt must have a closing resistance of 75 ohms at the EX terminal, while it
must be removed at the transit shunts (see base diagram VCC/01GC on page 41).
For distribution of the video signal on several upright columns and cascaded, see the
system variants VCC/GR and VCC/GS on page 72, 73.
General warnings installation warnings
• Read and strictly follow the instructions provided by the manufacturer.
• All devices must be assigned exclusively to the use for which they were designed.
• Carry out the installation in compliance with the regulations in force.
• Disconnect the power supply before carrying out any cleaning or maintenance
operation.
• Never obstruct the ventilation or heat dispersal openings or slits.
• Should the equipment fail or malfunction, disconnect the power supply and do not
tamper with it. If repair is necessary, only use an assistance centre that is
authorised by the manufacturer.
• Make sure that the system power supply includes a switch with magnetothermal
protection.
• Make sure that the rating plate data corresponds to that of the distribution network
before making any connections.
• Only use the power suppliers for the use for which they have been specifically
Conductors
m
m
m
m
m
20
50
100
200
300
0,30
0,50
0,80
1,00
1,50
mm
2
6/10
8/10
10/10
12/10
14/10
Ø
0,60
0,80
1,00
1,50
2,00
mm
2
9/10
10/10
12/10
14/10
16/10
Ø
0,60
0,80
1,00
1,50
2,00
mm
2
9/10
10/10
12/10
14/10
16/10
Ø
Coaxial cable
75 ohm RG 59U
4 P1 ~ ~*
+ - Monitor
designed, namely, for powering intercom and video intercom systems; any other
use is to be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for any damage arising from
improper, incorrect or unreasonable use.
• Always leave this warning document together with the power suppliers.
Advice and reminders for the user
• Never open or tamper with the monitor as it uses high voltage.
• Avoid shocks or blows to the monitor that could cause breakage of the screen.
• To clean the screen, use only a dry cloth.
• Never connect the monitor to voltages higher than 24 V AC-48 V DC.
• In the event of failure, modification or intervention on the devices in the system,
always contact the authorised installer.
Declaration of conformity
All the products are compliant with the provisions of directive 2006/95/CE (which
replaces directive 73/23/CEE and subsequent amendments) and this fact is certified
by the presence of the CE mark on all of them.
Technical assistance service
The
Comelit Group
designs and manufactures high-quality devices for the telephone
intercom, intercom, video telephone intercom and video intercom and CCTV access
control systems that it sells worldwide.
For all your present and future needs, please feel free to contact our Technical Office
(specifying the product you wish to discuss), who will put you in direct contact with a
specialist technician. Alternatively, customers in Italy can contact the COMELIT
(S.A.T.CO.) ASSISTANCE SERVICE for your region.
The
Comelit Group
reserves the right to vary the features and dimensions of the
equipment without any prior notification.
Testing the system
Make sure that the system has been implemented according to instructions and that it
strictly adheres to the chosen diagram and that the cross sections of the conductors
correspond to those specified at the side.
• Using appropriate tools, make sure that there are no short circuits in the system.
• Connect the mains voltage to the power suppliers, making sure that this voltage is
within 10% of the rated voltage.
• Make sure that the monitor is working properly.
For the audio part:
The call and its adjustment, the conversation and the button for the electric locking.
For the video part:
Adjust the brightness in order to achieve a good-quality image.
• The audio porter is already adjusted for optimum amplification.
If there is any striking (Larsen effect), slightly reduce the volume of the external
loudspeaker using the potentiometer located on the porter itself.
• For a more detailed check, it is recommended that you insert a milliammeter in
series to the + conductor of the monitors in output from the power supplier in order
to make sure that the power consumption of the individual monitors is correct.
• If any problems arise in operation, please refer to the following "Fault finding"
paragraph.
FAULT FINDING
If any fault occurs in the system, proceed as follows:
• Check for the presence of mains voltage at the power suppliers and make sure that
its value is not 10% more or less than the rated voltage
• For the audio part, check for the presence of output voltages, both alternating and
continuous.
In the case of short circuits, voltages are protected by PTCs and are cancelled. To
restore them, cut off the mains voltage for about one minute, rectify the short circuit
and restore the mains voltage
• For the video part, check for the presence of output voltages for the video camera
and monitors after making a call. The voltages are provided in the power unit Art.
4594 by a green LED and a red LED respectively, visible by opening the hatch
• Make sure that no modifications have been made to the system. If any changes
have been made, make sure that they are compatible with the operation of the
system itself.
GB
2, 3, S
