Figure 2: SA Bus Terminal Block Wiring
3. The SA Bus port on the controller is an RJ-12, 6-
position modular jack that provides a connection
for the Mobile Access Portal (MAP) Gateway, the
VAV Balancing Tool, specified network sensors, or
other SA Bus devices with RJ-12 plugs. Wire the SA
Bus port as shown in Figure 3.
Note:
The SA port is connected internally to
the SA Bus terminal block.
Figure 3: Pin Number Assignments for SA Bus
Ports
4. Wire the Power Supply Terminal Block. The ATC
uses a 240 VAC, +/-10% supply power terminal
two-pin, three-position, red connector.
a. Connect the supply wires to the red plug-
in terminal block as shown in Figure 4.
b. Insert the plug-in terminal block into the
ATC. For the location of the ATC power
input, see Figure 6.
Figure 4: Power Supply Wiring
A: Line
B: Neutral
Maximum Cable Length versus Load Current
For this system to operate correctly, the maximum
wire length is 137.2 m (450 ft) and the wire cross-
sectional area is 1.5 mm
2
(16 AWG) to 0.5 mm
2
(22
AWG).
Input and Output wiring guidelines
Table 2 and Table 3 provide information and guidelines
about the functions, ratings, and requirements for the
controller input and output terminals, and guidelines
for determining proper wire sizes and cable lengths.
In addition to the wiring guidelines in Table 2 and Table
3, observe these guidelines when wiring controller
inputs and outputs:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All input and output cables, regardless of wire size
or number of wires, should consist of stranded,
insulated, and twisted copper wires.
• Shielded cable is not required for input or output
cables.
• Shielded cable is recommended for input
and output cables that are exposed to high
electromagnetic or radio frequency noise.
• Inputs/outputs with cables less than 30 m (100 ft)
typically do not require an offset in the software
setup. Cable runs over 30 m (100 ft) may require an
offset in the input/output software setup.
ATC1510 Advanced Terminal Unit Controller Installation Guide
4
