AutomationDirect SureServo2 Podręcznik - Strona 7
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• Operation mode: General
• If the servo drive is equipped with a residual-current circuit breaker for current leakage
protection, to avoid incorrect operation of the RCD (Residual Current Device), please select a
circuit breaker with sensitivity of at least 200mA and with minimum 0�1 sec working time�
• Select Type B residual-current circuit breaker (with time delay) ONLY if the system ground
wire may contain DC electricity�
• Please use the circuit breaker and fuse that comply with the UL/CSA standard�
2.6 - Ferrite Ring
The movable or round-shaped 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 a
low-frequency signal; however, when the frequency of the signal increases, the impedance
may increase dramatically. Use the ferrite ring to optimize signal transmission and suppress
high-frequency noise, and reduce high-frequency interference in the power and signal cables.
Ferrite Ring Model
SV2-TOR1
Installation Precautions
The ferrite ring is commonly used when peripheral devices (such as a 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. As the frequency of the signal increases (Servo On state), the resistance of the parasitic
capacitance becomes small enough to let common-mode current flow through. Normally,
common-mode current only leads to common-mode interference due to an unstable circuit
caused by a poor connection between the power circuit and 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 potential.
The ferrite ring causes eddy current losses to the high-frequency signal and transforms it 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.
Winding several turns of wire onto the ferrite ring can increase inductance and the ability to
filter out high-frequency noise.
The suggested winding methods are shown below:
1) When the wire size (AWG) is small enough to wrap around the ferrite core at least once:
SureServo2 User Manual – 1st Edition – 05/20/2021
Applicable Servo Drive Model
All
Recommended for up to 4.5 kW systems
Chapter 2: Installation
Page 2–7