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Internal volume: turn trimmer INT in a similar way.
Turn down both volumes slightly if feedback loop howl occurs to eliminate the problem.
CALL SHORT CIRCUIT PROTECTION
The protection system will cut off calls for a few seconds in the event of a calling terminal short circuit. After
this time, the door panel will be able to generate a new call. The cycle will be repeated when the next call is
generated if the short circuit problem is not solved.
ELECTRIC LOCK COIL PROTECTION, USE OF THE JUMPER J1
The module GVM 70 is equipped with a protection on the door release input that allows current to the coil
of the electric lock for a maximum time of about 3 sec. In those cases where it is necessary to by-pass this
protection it is necessary to separate the speaker set from the aluminium front panel, open the plastic housing
of the speaker and then insert the jumper J1 located on the lower part of the circuit near to the lock release
relay. For this operation it is suggested to get in contact with the Bitron Video technical centre.
J1
CONNECTIONS
The following rules must be observed for connections:
-
Follow the instructions shown in the table carefully.
-
Avoid installing system wires close to electrical mains wires (they should be at least 30 cm apart).
-
Connect the ground wires exactly as shown in the diagrams to avoid buzzing.
-
Position the power supply at a maximum distance from the door panel of 50 metres.
2
-
Use 1.5 mm
wires for connecting terminals ~ and ~ for + and -
-
Also respect the connections shown on the diagram to prevent noise.
-
Calling terminals must be used only for their intended use to avoid audio faults.
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Internal volume
External volume
DS90368-001A
TECHNICAL SPECIFICATIONS
Power: .......................................................................................................... 12 Vac (80 mA stand-by)
Dimensions: ........................................................................................................... 110 x 120 x 56 mm
Weight: ....................................................................................................................................280 g
TROUBLESHOOTING
The GVM audio-video door panel is a very traditional device. The call generator and all the functions needed
to switch the monitors on are found within the audio-video module itself.
Two effects are generated when the call button is pressed in a traditional system:
•
a two-tone call is generated, sent to the column, and used either to operate the ringer and to switch on
the monitor;
•
the video section of the system is switched on and video and power signals are sent to the column.
The following table shows how to solve problems occurring in traditional systems.
Fault
Cause
Panel does not
No power 12Vca
light up
No audio and
No power 12Vca
video
Incorrect or missing
connection of CD
terminal
No audio
No system wire
connection
No connection of
No video
wires A and B
No power 20Vcc
Monitor off
Wrong connection of
wires 1 and 3
Wrong connection of
wire C
Call not available
No power
Problems in the
Picture not sharp
connection of wires A
or disturbed
and B
System wiring
Disturbed audio
problems
Door opening
System wiring
function not
problems
working
DS90368-001A
Possible solution
•
Power unit wires not connected to L terminals of door
panels
•
Power unit fuses blown
•
Power unit wires not connected to terminals ~ and ~ of the
GVM video unit
•
Power unit fuses blown
Check CD wire connections from GVM unit to CD terminal of
panels
Check that P terminals on the panels are actually connected to
C terminals of the monitor or to terminal 2 of the door phone
Check wires A and B of the video unit or connected monitor
•
Power unit wires not connected to terminals + and - of the
GVM video unit
•
Power unit fuses blown
Check wires 1 and 3 of the video unit or connected monitor
Check connection between terminal P of panel and terminal C
of monitor
Power to terminals 1 and 3 for generating the call is needed
for some monitors
Wires A and B not correctly installed or interference from nearby
high-voltage wires. Check wire installation.
Check position of wires in riser column.
Check nearby electrical devices, such as gates, lights or other
similar devices.
•
Check wires 1 and CD in the system
•
Check wire cross-section area and distances
•
Use a supplementary power unit if the distances are
excessive
20 Vdc 0.3 A
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