alphatronics AlphaVision ML - Maximum Distance between an Expansion Module and Its Power Supply

Installer manual AlphaVision ML Rev. 3.60 01-01-2015 32
Maximum distance between an expansion module and its power supply
Standard RS-485 cable
In the following calculations, the standard recommended bus cable (art.nr. 008653) is used. This cable is a
twisted pair, 4 wire, with a foil shield and solid earth conductor with an ohmic resistance of 10 ohms per
100 meters.
Keypads
The AlphaVision ML LCD keypad has a current consumption of 15mA in idle state. This is with the LCD
backlight + LEDs programmed as 'Off', see system programming. When using the recommended cable
(art.nr. 008653), this is equivalent to a voltage drop of 0.12 V per 100m. On an LCD keypad in the worst case
situation (no mains supply and minimal battery voltage) the incoming supply voltage must not be below 8V.
The maximum length between the nearest power supply (control panel or I/O module) and the LCD keypad
assuming a voltage drop of 2V will theoretically be 1567m.
However: if a code is entered, this automatically switches on the backlight, causing a temporary current
consumption of 65mA. This increases the voltage drop along the cable to 650mV per 100m. The maximum
distance between the power supply and the keypad is thus limited to 308m.
The AlphaVision ML LCD/PROX keypad consumes maximum (all LEDs and LCD lights are on and a TAG is
presented) 140mA. When using the recommended cable (art.nr. 008653), this is equivalent to a voltage
drop of approximately 1.1 V per 100m. On an LCD/PROX keypad in the worst case situation (no mains supply
and minimal battery voltage) the incoming supply voltage must not be below 8V. The maximum length
between the power supply (control panel or I/O module) and the LCD/PROX keypad assuming a voltage
drop of 2V will be approximately 200m (180m).
An external proximity reader consumes up to 56mA. When using the recommended cable (art.nr. 008653),
this is equivalent to a voltage of 0.56 V per 100m. On a Proximity reader in the worst case situation (no
mains supply and minimal battery voltage) the incoming supply voltage must not be below 8V. The
maximum distance between the power supply and the proximity reader using a voltage drop of 2V is 375m.
On the AlphaVision ML you can also connect existing AlphaVision NG LCD/PROX or AlphaBox LCD/PROX
keypads. In the programming under Installer menu / System options / Configuration / Keyboards / Keyb.
Type you can program for each keypad which ‘Keyboard type’ it is. The power consumption for these
keypads can be found in the service manual of the AlphaVision NG or AlphaBox.
Detectors
Hard-wired Detectors are connected with a 4 - (or 6 -) core cable to the inputs of the control panel (or input
+ 8 OC module or I/O module). When using a EOL (End of line) configuration a 4-wire cable is sufficient,
otherwise a 6-core cable used. For both situations both a non-shielded cable and shielded cable (art.nr.
008685 and 008687) can be used. For most Visonic detectors in worst case situation (no mains supply and
minimal battery voltage) the incoming voltage should not be below 9V.