4-7
H
Capacitive Coupling Path
Countermeasure
Purpose
Precautions
Wiring
Separation of signal lines Reduction of capacitive
coupling
Keep signal lines at least
10 cm away from each
other.
Ideally, the signal lines
are kept 30 cm away
from each other.
10 to 30 cm
Shielding with conductive
materials (panel or metal
conduit)
Reduction of capacitive
coupling
Be sure to connect the
shield to the FG (frame
ground).
Ground only one end of
the shield.
The shield must be free
of any current flow.
H
Conductive Path
Countermeasure
Purpose
Precautions
Wiring
Noise filter
Attenuation of
high-frequency energy
Apply noise filters to
power supply lines so
that the noise filters will
perfectly separate control
and power lines.
Power
supply
Control
equipment
Servo
Driver
H
Electromagnetic Inductive Path
Countermeasure
Purpose
Precautions
Wiring
Separation of signal lines Reduction of magnetic
force
Keep signal lines at least
10 cm away from each
other.
Ideally, the signal lines
are kept 30 cm away
from each other.
10 to 30 cm
Twisted-pair wires for
signal and return lines
Reduction of area
influenced by magnetic
field
Cancellation of magnetic
field by wires twisted
opposite to each other
The twisted-pair wires
must not be more than
5 cm long.
Power and signal lines
must be different to each
other in twisting pitch.
Magnetic field
The magnetic field is
canceled by wires twisted
opposite to each other.
5 cm max.
Countermeasures Against Noise
Chapter 4
AUDIN - 7 bis rue de Tinqueux - 51100 Reims - France - Tel : 03.26.04.20.21 - Fax : 03.26.04.28.20 - Web : http: www.audin.fr - Email : [email protected]