SA bus terminal block
The SA Bus terminal block is a brown, removable, 4-
terminal plug that fits into a board-mounted jack.
Wire the removable SA Bus terminal block plugs on
the controller, and other SA bus devices in a daisy-
chain configuration using 4-wire twisted, shielded
cable as shown in Figure 4. For more information
about the SA Bus terminal function, requirements,
and ratings, see .
Figure 4: SA bus terminal block wiring
Note:
The SA PWR terminal supplies 15 VDC.
The SA PWR terminal can be used to connect
(daisy chain) the 15 VDC power leads on the SA
bus.
SA Bus Port
The Sensor (SA Bus) port on the bottom of the
controller is an RJ-12, 6-position modular jack
that provides a connection for the Wireless
Commissioning Converter, the VAV Balancing Tool,
specified network sensors, or other SA Bus devices
with RJ-12 plugs. When the FEC is configured for N2
network communication, the SA Bus port must be
used to download and commission the controller.
A DIS1710 Local Controller Display also can be
connected to the SA Bus port.
The Sensor port is connected internally to the SA
bus terminal block.
Supply power terminal block
The 24 VAC supply power terminal block is a gray,
removable, 3-terminal plug that fits into a board-
mounted jack on the top right of the controller.
Wire the 24 VAC supply power wires from the
transformer to the HOT and COM terminals on the
terminal plug as shown in Figure 5. Do not use the
middle terminal on the supply power terminal block.
See for more information about the Supply Power
Terminal Block.
Figure 5: 24 VAC supply power terminal block
wiring
Note:
The supply power wire colors may
be different on transformers from other
manufacturers. Refer to the transformer
manufacturer’s instructions and the project
installation drawings for wiring details.
Important:
Connect 24 VAC supply power
to the field controller and all other network
devices so that transformer phasing is uniform
across the network devices. Powering network
devices with uniform 24 VAC supply power
phasing reduces noise, interference, and
ground loop problems. The field controller
does not require an earth ground connection.
Terminal Wiring Guidelines,
Functions, Ratings, and
Requirements
Input and output wiring guidelines
The following table provides information and
guidelines about the functions, ratings, and
requirements for the controller input and
output terminals; and references guidelines for
determining proper wire sizes and cable lengths.
FAC4911 Advanced Application Field Equipment Controller Installation Guide
6