GE Fanuc IC697MDL340H Series 90-70 Output Module

Description

Noise problems can be avoided in a variety of ways. The easiest way to avoid noise problems is in the proper routing of high and low level signal wiring. Keep low level wiring in separate conduit from high power wiring. The separate conduit provides a shield from electrical noise. If high and low power wiring must be run in the same duct, try to keep them a minimum of three to four inches apart. Also, if the two must cross each other, they should cross at a ninety degree angle to each other. Sometimes this is not practical.

A second way of protecting from electrical noise problems is to run low level wiring in shielded cable. It is very expensive to run all wiring in this manner, so only certain signals are run in this manner. The shield provides a conductor external to the actual signal wiring to collect any induced voltage from surrounding high power wiring.

The shield or "drain", as it is often referred to, is then connected to ground on one end. With the induced voltage connected directly to ground, the induced spike is suppressed immediately before affecting the actual signal being shielded. The shield or "drain" should never be connected to ground at both ends.

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