RiTTO TWINBUS, Системное руководство

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General Information
General Information
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General Information
1.1 Cable networks
Existing lines can be used as bus lines. We recommend the following, commercially available telecommunication
lines:
„
Telecommunication line J-Y (St) Y
„
Telecommunication line J-2Y (z) Y with strain-relief
„
Telecommunication grounding cable, longitudinally and transversally waterproof
For more information, please refer to the planning manual.
1.1.1 Cable layout
It is recommended to lay the bus line from subscriber to subscriber and to connect it to the connection terminal on the
device.
All the line screening sheaths must be connected across the joints and laid to Terminal b on the TwinBus power
supply unit. Please use appropriate locally provided terminals for this.
The stranded video line Va/Vb can generally be laid in the cable with the screened a/b lines.
In order to fulfil the general safety requirements for telecommunication systems complying to VDE 0800 and prevent
disturbances on the lines, ensure that the mains voltage and SELV (TwinBus line) are laid separately. A clearance of
10 cm must be maintained for the installation. In the case of a common line cabling, a separating webbing must be
inserted in the installation channels.
The bus lines must be terminated with terminal resistors.
Please follow the installation instructions for the indoor video stations 1 7855, 1 7857 or the handsfree video intercom
units 1 7835 and 1 7845.
1.1.2 Maximum line lengths
The loop resistance of each TwinBus line must not exceed max. 20 Ohm. This results in the following maximum line lengths:
Line lengths for 75
Ω
COAX lines
Caution!
Malfunctions due to strong magnetic fields
No other devices with strong magnetic field (contactors, transformers, etc.) may be installed in the
direct vicinity of the power supply unit and additional devices. Malfunctions could be caused by
induced voltage peaks.
Wire diameter in mm 0,8 0,6
Resistance in Ohm / m 0,0349 0,0621
Line lengths between TwinBus power supply unit 1 7573 and indoor telephone or indoor
video station
280 m 160 m
Line lengths between TwinBus power supply unit 1 7573 and door unit (lighting) 60 m 30 m
Line lengths between TwinBus power supply unit 1 7573 and door openers up to 8V/1A 50 m 30 m
Line lengths between power supply unit 1 4874 and indoor video station 100 m 60 m
Line lengths between mains transformer 1 6477 and indoor video station 50 m 35 m
Line lengths between mains transformer 1 6477 and camera module 35 m 25 m
Line lengths between mains transformer 1 6477 and camera module 150 m 100 m
Line lengths between mains transformer 1 6477 and built-in camera 40 m 20 m
Cable type Line lengths
3/S – 75 250 m
1.1/7.3 600 m