VESDA
®
LaserSCANNER Installation Manual
Version 1.3 3
2. Cabling Requirements
The terminals on the termination card in the LaserSCANNER will accept wire sizes up to 2.5sq
mm (12 AWG).
2.1 Power Cables
Use the power ratings for the detector and the modules to determine the required wire sizes.
Refer to the table below for power ratings.
2.2 Power Consumption
The power requirements for the detector to operate are as follows:-
Operating voltage:
18VDC to 30VDC
Power Consumption (W)
@ 24VDC
Current Consumption (mA)
@ 24VDC
Quiescent With Alarm Quiescent With Alarm
LaserSCANNER with
Blank Plates @ 3000rpm
5.76 7.44 240 310
LaserSCANNER with
Blank Plates @ 3500rpm
6.96 8.64 290 360
LaserSCANNER with
Blank Plates @ 4000rpm
7.68 9.12 320 380
LaserSCANNER with
Blank Plates @ 4200rpm
8.16 9.6 340 400
Programmer Module
1.08
(Backlight Off)
1.44
(Backlight On)
45
(Backlight Off)
60
(Backlight On)
Display Module Only 1.44 2.64 60 110
Table 1 Power and Current Consumption for LaserSCANNER Detector and Modules
2.3 Data Cables
The recommended RS 485 data cable for interconnecting to other detector units on the
VESDAnet loop is Belden 9841 (or equivalent). The cable characteristics are as follows:-
• 24 AWG, Twisted pair, Shielded, 120 ohms impedance
The maximum specified length for the RS485 cable between any two devices on VESDAnet is
1300m (4000ft).
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