Appendix
9
9
.
.
4
4
.
.
2
2
A
A
D
D
D
D
R
R
E
E
S
S
S
S
A
A
B
B
L
L
E
E
L
L
O
O
O
O
P
P
C
C
A
A
B
B
L
L
I
I
N
N
G
G
Applies to:
•
Signalling Line Circuit (SLC) loops. Refer to the
SLC Wiring Manual
for more detailed specifications and
specific device listings.
Requirements:
Recommended
TWISTED pair, NOT shielded
. The cable should have short overall twist lengths (8 or
Cable
more twists per metre).
Max
distance
Recommended cable type (unshielded):
*3810 m using 3.25 mm
2
Twisted-unshielded pair
*3000 m using 2.5 mm
2
Twisted-unshielded pair
*2000 m using 1.5 mm
2
Twisted-unshielded pair
*1000 m using 0.75 mm
2
Twisted-unshielded pair
Others:
1000 m using 0.75 mm
2
, 1500 m using 1.5 to 3.25 mm
2
Twisted-shielded pair
1000 m using 0.75 mm
2
, 1500 m using 1.5 to 3.25 mm
2
Untwisted-unshielded cable
Maximum
130 mA: LCM-320
Current
100 mA: LEM-320
400 mA max**: Single SLC loop
Maximum
Maximum
50 ohms
(supervised and power-limited).
resistance
For more information on installation checks, refer to section 9.6.4.2 Analog Loop Installation
checks and fault finding
Maximum
Maximum total capacitance for all SLC wiring (both between conductors and from any
Capacitance
conductor to ground) should not exceed 0.5 microfarads
Notes:
Usage of shielded or flat cable for the SLC loops is not recommended and should be
avoided where possible.
Fire rated cables may be required as per AS1670, AS1668, and AS2118.
Separate 2 core cable to be run for 24VDC power to FZM-1 and FCM-1 modules
*Max distance of the loop is governed by the total loop resistance and will depend on the type of cable used.
Always check the cable specification to ensure the total loop resistance will be less than
50 ohms
for the required
length of cable. A higher resistance than 50 ohms will result in communication problems on the addressable loop.
**MAX SHORT
CIRCUIT…CIRCUIT WILL SHUT DOWN UNTIL SHORT CIRCUIT CONDITION IS CORRECTED.
Floating Shield
Twisted-
unshielded
wire is recommended. If twisted-shielded pair wire is installed, use a floating shield to
terminate the wire. The following precautions must be met:
• IF THE SLC IS MORE THAN 900 M, DIVIDE THE SHIELD INTO FLOATING SEGMENTS OF LESS THAN 300 M.
• TO DIVIDE THE SHIELD WIRE INTO FLOATING SEGMENTS, CUT SHIELD EVEn with jacket and tape as shown:
NOTE:
Using shielded wire in applications where it is not recommended will reduce the maximum SLC length. If
shielded wire must be used where not recommended, failing to float the ends will reduce the maximum SLC
length even further.
AFP-2800/2802 Manual
– P/N DOC-01-011
103
Summary of Contents for AFP-2800
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