Johnson Controls FX-PCX3731, Руководство по установке

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Maximum Cable Length versus
Load Current
Use Figure 8 to estimate the maximum cable length
relative to the wire size and the load current (in mA) when
wiring inputs and outputs.
Note: Figure 8 applies to low-voltage (<30V) inputs and
outputs only.
Figure 8: Maximum Wire Length for Low-Voltage (<30V) Inputs and Outputs by Current and Wire Size
SA/FC Bus and Supply Power
Wiring Guidelines
Table 5 provides information about the functions, ratings,
and requirements for the controller communication bus
and supply power terminals; and guidelines for wire sizes,
cable types, and cable lengths when wiring the controller
communication buses and supply power.
In addition to the guidelines in Table 5 , observe these
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 FX-PC Series Controller MS/TP
Communication Bus Technical Bulletin
(LIT-12011670)
for detailed information regarding
wire size and cable length requirements for the SA
and FC buses.
10 FX-PCX3731 Input/Output Module Installation Instructions