Parts Of Measure Against Noise - Mitsubishi Electric Melsec-Q172DCPU User Manual

7 EMC DIRECTIVES

7.1.3 Parts of measure against noise

(1) Ferrite core
A ferrite core has the effect of reducing noise in the 30MHz to 100MHz band.
It is not required to fit ferrite cores to cables, but it is recommended to fit ferrite
cores if shield cables pulled out of the enclosure do not provide sufficient
shielding effects.
Note that the ferrite cores must be fitted to the cables in the position immediately
before they are pulled out of the enclosure. If the fitting position is improper, the
ferrite will not produce any effect.
• Ferrite core (Recommended product)
Manufacturer
TDK
(2) Noise filter (power supply line filter)
A noise filter is a component which has an effect on conducted noise.
The attachment of the noise filter to the power supply line of the servo amplifier
and Multiple CPU system's power supply is effective for the reducing noise.
(The noise filter has the effect of reducing conducted noise of 10 MHz or less.)
• Noise ferrite (Recommended product)
Manufacturer
Mitsubishi Electric
Soshin Electric
The precautions required when installing a noise filter are described below.
(a) Do not bundle the wires on the input side and output side of the noise filter.
When bundled, the output side noise will be induced into the input side wires
from which the noise was filtered.
Noise filter
The noise will be included when the
input and output wires are bundled.
(b) Ground the noise filter grounding terminal to the control cabinet with the
shortest wire possible (approx. 10cm (3.94 inch)).
Model name
ZCAT3035-1330
Model name
HF3010A-UN
Input side Input side
(power supply side) (power supply side)
Induction
Output side
(device side)
Figure 7.4 Precautions on noise filter
7 - 6
FR-BLF
Noise filter
Separate and lay the input and
output wires.
Output side
(device side)