2-6
Chapter 2: Installation and Wiring
User’s Manual Pub. 0300128-04 Rev. A
WARNING
Remove power before removing or inserting this module. When you
remove, or insert, a module with power applied, an electrical arc may
occur. An electrical arc can cause personal injury or property damage by:
•
Sending an erroneous signal to your system’s field devices,
causing unintended machine motion.
•
Causing an explosion in a hazardous environment.
•
Electric arcing causes excessive wear to contacts on both the
module and its mating connector and may lead to premature
failure.
Before wiring the terminal block, take some time to plan your system:
•
Ensure that the SLC 500 system is installed in a NEMA-rated enclosure
and that the SLC 500 system is properly grounded.
•
Ensure that the load resistance for a current output channel is less than
500
Ω
.
•
Ensure that the load resistance for a voltage output channel is greater
than 1 k
Ω
.
•
Route the field wiring away from any other wiring and as far as possible
from sources of electrical noise, such as motors, transformers, contactors,
and AC devices. Generally, allow at least 6 in. (about 15.2 cm) of
separation for every 120 V of power.
•
Routing the field wiring in a grounded conduit can reduce electrical
noise further.
•
If the field wiring must cross AC or power cables, ensure that they cross
at right angles.
To wire your module, follow these steps:
1.
Determine the length of cable you need to connect a channel to its field
device. Remember to include additional cable to route the drain wire and
foil shield to their ground points.
2.
At each end of the cable, strip some casing to expose the individual
wires.
3.
Trim the exposed signal wires to 2 in. lengths. Strip about 3/16 in. (about
5 mm) of insulation away to expose the end of each wire.
4.
At one end of the cable, twist the drain wire and foil shield together,
bend them away from the cable, and apply shrink wrap.
5.
At the other end of the cable, cut the drain wire and foil shield back to
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Страница 30: ...3 8 Chapter 3 Configuring the 1746sc INI4I User s Manual Pub 0300128 04 Rev A...
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