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4-8
4-8
H
Radio Transmission Path
Countermeasure
Purpose
Precautions
Wiring
Noise filter
Attenuation of
high-frequency energy
The section not
attenuating
high-frequency noise
should be made as short
as possible.
Servo Driver
Short in distance
P
ow
er
su
pp
ly
Shielding with conductive
materials
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.
Servo Driver
P
ow
er
su
pp
ly
Note
The noise filter on the Servo Driver output side must be a dedicated noise filter that does not use a
capacitor.
H
Current Leakage
Countermea-
sure
Purpose
Precautions
Wiring
Noise filter
Attenuation of high
frequency energy of
common mode (between
the power line and FG).
Use a noise filter that
eliminates common mode
noise.
At the very least, the
control equipment must
use the noise filter.
Power
supply
Control equipment
Servo Driver
Ground with a
short, thick wire
Purging leakage current
quickly to reduce voltage
changes.
Use wire of 2.0 mm
2
or
more.
The wiring distance must
be as short as possible.
Ground each wire at a
resistance of less than
100
W
.
supply
Servo Driver
Noise filter elimi-
nating common
mode noise.
As short as
possible to the
ground.
4-2-3 Other Countermeasures
If Servo System errors still result after all countermeasures described above, the following may be ef-
fective for some Position Control Unit and Servo Driver models.
D
Positioning Point Deviation (Position Control Unit with Pulse Output)
Error
Command pulse input is subjected to noise interference and the Servo Driver handles the noise as com-
mand pulses.
Countermeasures
Separating the power supply.
Use a dedicated power supply for the pulse output of the Position Control Unit.
Separate the ground line.
Countermeasures Against Noise
Chapter 4
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