Rockwell Automation 1746-HSRV SLC Servo Control Module User Manual - Manual (Page 34)

Publication 1746-6.1.2 - July 2000
Planning Hardware Installation 3-3
Classifying Your
Conductors Use the table below for cable routing guidelines and determining wire
and cable functions.
Placing Your SLC Servo
Module When you plan your SLC Servo Module placement:
•
Divide modules, as much as possible, into the following types:
• AC
• High-level DC
• Low-level digital DC (TTL, encoder, pulse output)
• Analog I/O
• Intelligent I/O modules (for example, the SLC Servo Module)
•
Place the SLC Servo Module as close to the SLC processor as
possible.
•
Keep your SLC Servo Module as far away as possible from DC
and AC I/O modules. Distance protects the intelligent
(CPU-based) modules from the heat and electrical noise of the
DC and AC I/O modules.
For these wires
and cables: To: Follow these guidelines for routing inside or
outside an enclosure:
AC power lines
•
Connect high-power AC I/O lines to AC I/O
modules that are rated for high power and
high noise immunity.
•
Connect high-power DC I/O lines to DC I/O
modules that are rated for high power or
have input circuits with long time constant
filters for high noise rejection. They typically
connect to devices such as hard-contact
switches, relays, and solenoids.
•
Route these high-power AC lines with machine
power conductors of up to 600V AC (feeding up
to 100 hp devices) if this does not violate local
codes.
•
Article 300-3 of the National Electrical Code
requires that all conductors (AC and/or DC) in
the same raceway are insulated for the highest
voltage applied to any one of the conductors in
the raceway.
SLC Servo Module cable
(1746-HCA) and
termination panel wiring
•
Connect serial communication cables to
programming terminals or data terminals,
and connect them from the scanner to
remote I/O adapter modules or PLC
processors.
•
Connect low-power AC/DC I/O lines to I/O
modules that are rated for low power such
as low-power contact-output modules.
•
Connect low-power DC I/O lines to DC I/O
modules that are rated for low power and
have input circuits with short time constant
filters to detect short pulses. They typically
connect to devices such as proximity
switches, photo-electric sensors, TTL
devices, encoders, motion control devices,
and analog devices.
•
Properly shield conductors, where applicable,
and route them in separate raceways. If
conductors must cross power feed lines, they
should do so at right angles.
•
Route these lines at least 1 foot from 110V AC
power lines, 2 feet from 240V AC power lines,
and 3 feet from 480V AC power lines.
•
Route these lines at least 3 feet from any
electric motors, transformers, rectifiers,
generators, arc welders, induction furnaces, or
sources of microwave radiation.
•
If the conductor is in a metal raceway or
conduit, that raceway or conduit must be
grounded along its entire length.