1/01 UDC3300 Limit Controller Product Manual 95
Section 9 - Appendix A
How to Apply Digital Instrumentation in Severe Electrical Noise
Environments
9.1 Overview
Guideline overview
Products that incorporate digital technology provide recognized
performance advantages over conventional analog instrumentation used
for process control. These advantages can result in better product
uniformity and greater overall efficiency when used correctly.
There are, however, certain guidelines regarding installation and wiring
which must be carefully followed in order to achieve this performance. In
addition to the traditional precaution of the separation of signal and power
wiring in separate conduits, other measures must be taken to minimize the
effects of electromagnetic interference (EMI) and radio frequency
interference (RFI) on the operation of the equipment. Otherwise, if high
level, short duration, noise spikes are permitted to enter the digital
equipment, the noise can be transferred into the system’s logic networks
and can be misinterpreted as signal data, resulting in erroneous system
operation and other unpredictable responses.
What’s in this section
This section contains the following information:
Topic See Page
9.1 Overview 95
9.2 Potential Noise Sources 96
9.3 Prevention Methods 97
9.4 Recommended Wiring Practices 98
9.5 Power Source Considerations 100
9.6 Noise Suppression at the Source 101
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