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1/03 UDC 6300 Process Controller Product Manual 15

2.5 Wiring

Taking electrical

noise precautions

Electrical noise is composed of unabated electrical signals which produce

undesirable effects in measurements and control circuits.

Digital equipment is especially sensitive to the effects of electrical noise.

Your controller has built-in circuits to reduce the effect of electrical noise

from various sources. If there is a need to further reduce these effects:

• Separate External Wiring - separate connecting wires into bundles (see

Table 2-4) and route the individual bundles through separate conduits or

metal trays.

• Use Suppression Devices - for additional noise protection, you may want

to add suppression devices at the external source. Appropriate suppression

devices are commercially available.

NOTE

For additional noise information, refer to Appendix B.

Permissible wire

bundling

Table 2-4 shows which wire functions should be bundled together.

Table 2-4 Permissible Wiring Bundling

Bundle No. Wire Functions

• Line power wiring

• Earth ground wiring

• Control relay output wiring

• Line voltage alarm wiring

2 Analog signal wire, such as:

• Input signal wire (thermocouple, 4 to 20 mA, etc.)

• 4-20mA output signal wiring

• Slidewire feedback circuit wiring

• Digital input signals

• Communications

3 • Low voltage alarm relay output wiring

• Low voltage wiring to solid state type control circuits

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United Security Products AVD-45c Handbuch Seite 29