Fike FCP-75, Instruction Manual

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66 FCP-75 Manual — P/N LS10147-003FK-E:A 3/17/2021
Fike IDP and SWIFT SLC Device Installation Wiring Requirements for SLC Devices
7.4 Wiring Requirements for SLC Devices
The following information applies to SLC devices. Refer to the section that describes the type of device you are installing for details.
7.4.1 Wire Sizing for Internal SLC
The SLC requires use of a specific wire type, depending on mode of operation, to ensure proper circuit functioning. Wire size should be no
smaller than 18 AWG and no larger that 12 AWG wire. The wire size depends on the length of the SLC circuit. It is recommended that all
wiring be twisted-pair to minimize the effects of electrical interference
7.4.2 Wiring Requirements for IDP Modules
The FCP-75 SLC can be programmed to operate in IDP mode. Use Table 7.4 to determine the specific wiring requirements for the SLC.
.Figure 7.1 and Figure 7.2 show how wire length is determined for out & back tap and T-Tap.
Figure 7.1 Calculating wire run length for a simple out and back
When you use T-taps, the total length of all taps and the main bus must be met in addition to the maximum distance requirements for the var-
ious wire gauges.
Wire Requirements Distance in Feet (meters) Wire Type
RECOMMENDED :
Twisted-unshielded pair, 12 to 18 AWG (3.31mm
2
to 0.82
mm
2
). 50 ohms, maximum per length of Class A and Class
X. 50 ohms per branch maximum for Class B loop.
12,500 ft. (3,810 m)
9,500 ft. (2895.6 m)
6,000 ft. (1,828.8 m)
3,700 ft. (1,127.76 m)
12AWG (3.31mm
2
)
14AWG (2.08mm
2
)
16AWG (1.31mm
2
)
18AWG (.082mm)
2
Untwisted, unshielded wire, in conduit or outside of conduit. 5,000 ft. (1,528 m)
3,700 ft. (,127.76 m)
12 to 16 AWG (3.31
2
mm to 1.31 mm
2
)
18 AWG (0.82 mm)
Twisted, shielded pair
Note:
• Shields must be isolated from ground
• Shields should be broken at each device
5,000 ft. (1524 m)
3,700 ft. (1,127.76 m) 12 to 16 AWG (3.31 mm
2
to 1.31 mm
2
)
18 AWG (0.82 mm
2
)
Maximum total capacitance of all SLC wiring (both between conductors and from any conductor to ground) should not exceed 0.5 micro
farads.
Table 7.4 SLC Wiring Requirements for IDP/ Modules