Ferrite Ring - Delta ASDA-B3 Series User Manual

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Installation

2.6 Ferrite ring

The ferrite ring suppresses high-frequency noise, reducing high-frequency interference in the

power cable, signal cable, and connectors. The ferrite ring is usually made of Mn-Zn ferrite. The

impedance of the ferrite ring varies with frequency. Normally, its impedance is relatively small to

low-frequency signals; however, when the frequency of the signal increases, the impedance

increases dramatically, which optimizes signal transmission. The suggested ferrite ring models

are as follows.

Ferrite ring model

ASD-ACFC7K00

Note: in the servo drive model name,

Installation precautions

The ferrite ring is commonly used when peripheral devices (such as the controller) are affected

by noise from conduction and radiation when the servo motor is in the Servo On state. The

parasitic capacitance between the cables in the wiring panel and the ground is typically small,

but as the frequency of the signal increases (in the Servo On state), the resistance of the

parasitic capacitance becomes small enough for the common-mode current to flow through.

Normally, common-mode current only leads to common-mode interference due to an unstable

circuit caused by a poor connection in the power circuit or between the servo drive and the

ground. If the common-mode current flows through the external cables, common-mode

interference may also happen due to electrical interference caused by unstable electric

The ferrite ring causes eddy current losses to high-frequency signals and transforms them into

heat when suppressing common-mode interference. The ferrite ring acts as a low-pass filter to

effectively suppress high-frequency noise and ensure the stability of the circuit while the

impedance to low-frequency signals is relatively small.

Applicable servo drive model

-1043- , ASD-B3 -1543-

represents the product series and

, ASD-B3 -2043-

, ASD-B3 -3043- ,

represents the model type.

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