Terminal Wiring Guidelines, Functions, Ratings, And Requirements; Input And Output Wiring Guidelines - Johnson Controls FX-PCA4911 Installation Manual

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 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 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
input and output terminals; and references guidelines for
determining proper wire sizes and cable lengths.
In addition to the wiring guidelines in the following table,
observe these guidelines when wiring 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 required for input and output cables
that are exposed to high electromagnetic or radio
frequency noise.
• Inputs or 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.
6 FX-PCA4911 Advanced Application Controller Installation Guide