
B-65322EN/02 SVM 6.INSTALLATION CONDITIONS AND NOTES
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6.3 NOISE PROTECTION
6.3.1 Separation of Signal Lines
If a power cable and signal cable run close to each other, noise can be
induced. So, ensure that a power cable is separated from a signal cable.
When a power cable and signal line cannot be separated from each
other for a reason, minimize the distance by which the two cables run
in parallel. When conduits are used, run a power cable through one
conduit, and run a signal cable through another conduit.
Cable type
Group Signal Action
Amplifier input power line
Motor power line
A
Magnetic contactor drive coil
(Note 3)
Separate these cables from those of
group B by bundling them separately
(Note 1) or by means of
electromagnetic shielding (Note 2).
Cable connecting the control
unit and servo amplifier
Sensor cable
B
Position coder cable
Separate these cables from those of
group A by bundling them separately
(Note 1) or by means of
electromagnetic shielding (Note 2). In
addition, shielding must be provided.
NOTE
1 The bundle of group A cables must be separated
from the bundle of group B cables by at least 10 cm.
2 Electromagnetic shielding involves shielding
groups from each other by means of a grounded
metal (steel) plate.
3 Attach a noise suppressor such as a spark killer to
the magnetic contactor drive coil.
Cabinet
Group A
Group B
Shielding plate
Section of duct
To operator's
panel, motor,
etc.
Cable of group A
Duct
Cable of
group B
Servo
amplifier
Control unit
Spindle
amplifier