Xtralis VESDA VLC-500, Руководство по установке

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VESDA by Xtralis VESDA VLC Installation Guide
www.xtralis.com 5
2 Cabling Requirements
The terminals on the termination card in the VESDA VLC will accept wire sizes up to 2.5mm² (12 AWG).
2.1 Power Cables
Use the power ratings for the detector to determine the required wire sizes.
The power requirements for the detector to operate are as follows:
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Operating voltage: 18 VDC to 30 VDC
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Current consumption: 225 mA max (No Alarm), 245 mA max (With Alarm)
2.2 Data Cables
The recommended RS485 data cable for interconnecting to other detector units on the VESDAnet loop is
Belden 9841 (or equivalent). The cable characteristics are as follows:
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24 AWG, Twisted pair, Shielded, 120 ohms impedance
The maximum specified length for the RS485 cable between any two devices on the VESDAnet network is
1300m (4000ft).