9
GB
Connection
Circuit diagram:
Connection with decentral power supply.
Circuit diagram:
Connection with central power supply.
Maximum 12 video indoor stations can be
supplied from the video 1 4874 power supply unit.
Starting up
The start-up can be made using the video indoor station or with
the apartment button. The start-up using the apartment button
is very useful if you do not have any access to the dwelling.
In order to allow the operator to change the call tone of the
main bell button, the main bell button must be programmed as
the main button when initial setting takes place. The procedure
must be repeated for other bell buttons.
You can use the intercom when two persons perform the start-
up.
The video connection between the video indoor station and the
door station is automatically set up when the pushbutton is
operated at the door station.
The video indoor station can be supplied decentrally from the
associated 1 6477 mains transformer. However, up to 12 video
indoor stations can also be supplied by the video 1 4874 power
supply unit.
Operating elements
1
Potentiometer, video picture signal strength
2
Red LED
Adjustment protection
An adjustment protection facility in the TwinBus power supply
unit allows the connected intercoms to be protected against
unintentional modifications – refer to the system manual
A negative acknowledge tone when the setting button is
pressed is an indication that the adjustment protection facility
has been activated.
Start-up using the video indoor station
One-man start-up
Two-man start-up
Note:
If the red LED illuminates, this means voltage is
present at the Va and Vb terminals to the next
videoindoor station. The video indoor station will not
switch on for safety reasons.
5
3
1
2
2
4
00651-0
S0101-2
1 7817
N
L
1
2
3
a
b
Vb
Va
ED
ED
1 6477
ED
Va Vb
a
b
ED
ED
ED
1 7817
Va Vb
N
L
+
1 4874
Va Vb
S00102-2
Activity
Result
Activity
Result
1
2
00665-0
RiTTO
< 1 min
RiTTO
RiTTO
2
’2’
’ok’
’ok’
’2’
RiTTO
< 1 min
’2’
RiTTO
