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4-6
4-6
4-2
Noise Suppression
Noise is generated from equipment and transmitted through unexpected transmission
paths. Noise suppression means the prevention of the generation of noise from such
noise sources and block the transmission of noise through noise transmission paths.
4-2-1 Countermeasures
The following four items are essential for noise suppression.
Searching for Noise Sources
Noise is generated from many types of equipment that make radical changes in voltage and current
output. The larger the signal power handled is, the more powerful the noise source will be. Refer to
4-1-2
Types of Noise
and list all probable noise sources close to the Servo System.
Clarifying Noise Transmission Paths
If a noise source, its type, and its characteristics are known, check all probable noise transmission paths
in sequence beginning with the most probable path, and find out which paths are used for noise trans-
mission. It may be a good idea to use a shield plate connected to the FG (frame ground) and check the
possibility of noise transmission through radio transmission, electromagnetic induction, and capacitive
coupling paths.
Cancellation of Countermeasures at Last Stage
Do not cancel countermeasures on any path if they are not effective. There may be more than one noise
transmission path. The path on which the countermeasures have been taken may be a secondary noise
transmission path.
Highly Possible Noise Transmission Path to Servo System
The Servo System or inverter has a high current leakage to the FG through the capacitive coupling of
the motor. Therefore, if the current absorption of the FG is poor, the electric potential of the FG will be
unstable. This will easily transmit noise to other equipment through the FG. Be sure to take countermea-
sures against such current leakage when using Servo Systems or inverters.
4-2-2 Practical Noise Suppression
The following describes practical noise suppression and current leakage suppression for each noise
transmission path.
Countermeasures Against Noise
Chapter 4
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