17
Maximum lengths of signal cables (of the line or bus).
The cross section (resistance) of the bus for digital transmission and audio track
(LINE terminals) has a significant impact on the maximum bus length for both
Audio and Video systems. For typical cable cross sections (0.5mm) the maximum
distance is 300 m. This distance increases with increasing wire cross section:
- with 1 mm
2
wire the maximum distance is 400 m
- with 1.5 mm
2
wire the maximum distance is 600 m
- with 2.5 mm
2
wire the maximum distance is 1000 m
Use CDNV-RJ45 module to increase the cross-section of the above mentioned
cables (UTP) in the video system.
For extensive video installations, use the CDNVRau-DIN splitter that features a
special output with video signal amplification.
PLEASE NOTE! To ensure proper functioning and use safety, connect the unit
panel (in metal frame) in its installation point to earth by connecting the grounding
terminal on unit’s body with relevant protective installation (PE).
Use a 1 mm
2
wire (such as LY1.0) for power supply connection of the door entry
unit and the E-lock.
For wires of other cross-sections use the following formula to calculate the
voltage drop:
2 x L[m] x I[A]
U = ------------------------------------ [V]
57 x S[mm
2
]
Where: L - panel to transformer wire length, for instance: - 15m.
I - current - panel during opening - 0.44A (panels with
backlit name tag
module)
S - wire cross section, for instance: - 1.0 mm
2
2 x 15 x 0.44
ΔU = ------------------- = 0.23V
57 x 1.0
PLEASE NOTE! The maximum voltage drop is 1.2V, or 10% of power supply
voltage. The maximum cable length for E-lock circuit is 7 m, for power supply
circuit - 15 m.
Too small cross-sections and extensive wire lengths may cause voltage drops
during connections or opening (E-lock release), leading to interference or
resetting (restart) of the unit.
2. Power supply connection:
In case of passive audio receivers (2-wire receivers) the door entry unit is
supplied from a mains transformer, the supply voltage is 12VAC (min. 11.5VAC),
connection to AC/AC terminals (12V~). Recommended mains transformer is TR
12V 1.2A or TR DIN 12V 1.2A, available from ACO.
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