Chapter 3-Installation
3-23
applications. Noise may be present only at certain times, may appear as widely-
spread intervals, or in some cases may exist continuously.
Noise commonly enters through input, output, and power supply lines and may also
be coupled through the capacitance between these lines and noise signal carrier lines.
This usually results from the presence of high voltage or long, close-spaced
conductors. When control lines are closely spaced with lines carrying large currents,
the coupling of magnetic fields can also occur. Use shielded cables to help minimize
noise. Potential noise generators include switching components relays, solenoids,
motors, and motor starters.
Refer to the relevant Federal, State/Provincial, and local electric codes which
provides data such as the size and types of conductors, color codes and connections
necessary for safe grounding of electrical components. It is recommended that the
high voltage and low voltage cabling be separated and dressed apart. In particular,
the AC cables and switch wiring should not be in the same conduit with all
communication cables.
Line Voltage Variation
The unit’s power supply is built to operate with output voltage ranges of 90-132
VAC and 180-264 VAC or 20-36 VDC, whichever applies, and still allow the system
to function within its operating margin. As long as the incoming voltage is adequate,
the power supply provides all the logic voltages necessary to support the processor,
memory, and I/O.
In cases in which the installation is subject to unusual AC line variations, use a
constant voltage transformer to prevent the system from shutting down too often.
However, a first step toward the solution of the line variations is to correct any
possible feed problem in the distribution system. If this correction does not solve the
problem, use a constant voltage transformer.
The constant voltage transformer stabilizes the input voltage to the 3510/3512 by
compensating for voltage changes at the primary in order to maintain a steady
voltage at the secondary. When using a constant voltage transformer, check that the
power rating is sufficient to supply the unit.
Creating a Power Cable
This section describes how to create both an AC and DC power cable.
AC Power Cable
You must create an AC power cable to supply power to units with AC power
supplies. You will need the following materials:
•
A three-position power connector (supplied).
