Det-Tronics EQP Fire and Gas Detection/Releasing System - Manual (Page 28)

3-9 14.1 95-8533
NETWORK AND NETWORK
EXTENDER INSTALLATION
Mounting
The device should be securely mounted to a vibration
free surface. (See the “Specifications” section in this
manual for device dimensions.)
Wiring
All devices on the LON are wired in a loop that starts
and ends at the System Controller. To ensure proper
operation, the LON should be wired using high speed
communication grade cable.
NOTE
Cable meeting the specifications listed in Table
3-6 is suitable for distances up to 2000 meters.
Any of the cable types listed in Table 3-7 can be used
for wiring the LON for the distances indicated.
NOTE
If no network extenders are used, the distances
listed are for the entire loop. If network extenders
are used, the distances listed are for the wiring
length between network extenders or between a
network extender and the System Controller.
Table 3-7—LON Maximum Cable Lengths
Note: *Use the same type of cable in each wiring segment
between network extenders.
**Maximum wire lengths represent the linear wire distance of
LON communications wiring between network extenders.
Be sure that selected cable meets all job specifications.
If necessary, consult factory for further suggested cable
types.
***Cables designed to ISA SP50 Type A or IEC 61158-2
Type A are suitable for use in LON/SLC wiring. For armored
version, contact cable manufacturer.
Table 3-6—Typical Specification for 16 AWG (1.5 mm 2 ) LON Wiring Cable per Echelon
Minimum Typical Maximum Units Condition
DC Resistance, each conductor 14 14.7 15.5 ohm/km 20 C per ASTM D 4566
DC Resistance Unbalanced 5% 20 C per ASTM D 4566
Mutual Capacitance 55.9 nF/km per ASTM D 4566
Characteristic Impedance 92 100 108 ohm 64 kHz to 1 MHz, per ASTM D 4566
Attenuation 20 kHz 1.3 dB/km 20 C per ASTM D 4566
64 kHz 1.9
78 kHz 2.2
156 kHz 3
256 kHz 4.8
512 kHz 8.1
772 kHz 11.3
1000 kHz 13.7
Propagation Delay 5.6 nsec/m 78 kHz
Length: 6,500 feet/2000 meters maximum (basic loop or between Network Extenders).
Type: Single twisted pair.
Wire Gauge: 16 AWG, stranded (19 x 29), tinned copper with overall shield.
Cables meeting these specifications are good for up to 2000 meters.
T0049B
Length: 6,500 feet/2000 meters maximum (basic loop or between Network Extenders).
Type: Single twisted pair.
Wire Gauge: 16 AWG, stranded (19 x 29), tinned copper with overall shield.
Cables meeting these specifications are good for up to 2000 meters.
LON Cable Maximum Length**
(Manufacturer and Part No.)* Feet Meters
Belden 3073F (Tray Rated) 6,500 2,000
Det-Tronics NPLFP 6,500 2,000
Technor BFOU 4,900 1,500
Rockbestos Gardex Fieldbus***
1 Shielded Pair, 16 AWG,
Type TC, p/n FB02016-001 6,500 2,000
1 Shielded Pair, 18 AWG,
Type TC, p/n FB02018-001 6,500 2,000