Section 4 Installation Guidelines - Parker H Series Installation & Service Instructions Manual

Safety Guidelines for the Application, Installation and Maintenance of Solid State Control
Section 4
Installation Guidelines
4.1 Installation and Wiring Practice
4.1.1
Proper installation and field wiring practices are of prime
importance to the application of solid state controls. Proper
wiring practice will minimize the influence of electrical
noise, which may cause malfunction of equipment.
User and installers should familiarize themselves with the
follow installation and wiring instructions in addition to
requirements of all applicable codes, laws, and standards.
The manufacturer of the device or component in question
should be consulted whenever conditions arise that are
not covered by the manufacturer's instructions.
4.1.2
Electrical noise is a very important consideration in any
installation of solid state control. While wiring practices
may vary from situation to situation, the following are
basic to minimizing electrical noise:
1. Sufficient physical separation should be maintained
between electrical noise sources and sensitive
equipment to assure that the noise will not cause
malfunctioning or unintended actuation of the control.
2. Physical separation should be maintained between
sensitive signal wires and electrical power and control
conductors. This separation can be accomplished by
conduits, wiring trays, or as otherwise recommended
by the manufacturer.
3. Twisted-pair wiring should be used in critical signal
circuits and noise producing circuits to minimize
magnetic interference.
4. Shielded wire should be used to reduce the magnitude
of the noise coupled into the low level circuit by
electrostatic or magnetic coupling.
5. Provisions of the 1984 National Electrical Code
respect to grounding should be followed. Additional
grounding precautions may be required to minimize
electrical noise. These precautions generally deal with
ground loop currents arising from multiple ground paths.
The manufacturer's recommendations should be followed.
➀ Available from National Fire Protection Association, Batterymarch
Park, Quincy, MA 02269
C.4.1.2
A great deal of effort goes into the design of solid state
equipment to achieve a reasonable degree of noise
immunity. Filters, shielding, and circuit design are all
used. It is, however, impossible to design equipment
which is impervious to every form of noise found in the
industrial setting.
When installing a system using solid state technology it is
wise to assume that electrical noise exists and install the
equipment in accordance with the recommended
guidelines to minimize problems.
Also see section 3.4.1.
➀ with
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