Sa/Fc Bus And Supply Power Wiring Guidelines - Johnson Controls MS-FEC2611 Series Installation Instructions Manual

SA/FC Bus and Supply Power
Wiring Guidelines
Table 5 provides information about the functions, ratings,
and requirements for the communication bus and supply
power terminals; and guidelines for wire sizes, cable
types, and cable lengths when wiring the controller's
communication buses and supply power.
Table 5: Communications Bus and Supply Power Terminal Blocks, Functions, Ratings, Requirements, and
Cables
Terminal Terminal
Block/Port Labels
Label
1 +
FC BUS
-
COM
SHLD
1
FC BUS
(Port)
1 +
SA BUS
-
COM
SA PWR
1 Sensor
Sensor
24~ HOT
COM
1 The SA Bus and FC Bus wiring recommendations in this table are for MS/TP bus communications at 38.4k baud. For more
information, refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034).
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Function, Electrical Ratings/Requirements
FC Bus Communications
Signal Reference (Common) for Bus communications
Isolated terminal (optional shield drain connection)
RJ-12 6-Position Modular Connector provides:
FC Bus Communications
FC Bus Signal Reference and 15 VDC Common
15 VDC, 180 mA, Power for Wireless Commissioning
Converter or ZFR1811 Wireless Router
SA Bus Communications
SA Bus Signal Reference and 15 VDC Common
15 VDC Supply Power for Devices on the SA Bus
(Maximum total current draw for SA Bus is 240 mA.)
RJ-12 6-Position Modular Connector provides:
SA Bus Communications
SA Bus Signal Reference and 15 VDC Common
15 VDC Power for devices on the SA bus and Wireless
Commissioning Converter
24 VAC Power Supply - Hot
Supplies 20–30 VAC (Nominal 24 VAC)
24 VAC Power Supply Common (Isolated from all other
Common terminals on controller)
35 VA
In addition to the guidelines in
guidelines when wiring an SA or FC bus and the 24 VAC
supply power:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All SA and FC bus cables, regardless of wire size,
should be twisted, insulated, stranded copper wire.
• Shielded cable is strongly recommended for all SA
and FC bus cables.
• Refer to the MS/TP Communications Bus Technical
Bulletin (LIT-12011034) for detailed information
regarding wire size and cable length requirements for
the SA and FC buses.
Recommended Cable Type
0.6 mm (22 AWG) stranded, 3-wire
twisted, shielded cable
recommended
Wireless Commissioning Converter
retractable cable or 24 AWG 3-pair
CAT 3 Cable <30.5 m (100 ft)
0.6 mm (22 AWG) stranded, 4-wire
(2 twisted-pairs), shielded cable
recommended.
Note: The + and - wire are one
24 AWG 3-pair CAT3 cable <30.5
m (100 ft)
0.8 mm to 1.5 mm
(18 AWG) 2-wire
Table 5, observe these
twisted pair, and the COM
and SA PWR are the
second twisted pair of
wires.
2
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