
B-65282EN/05 5.INSTALLATION
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5.3 NOISE PREVENTION
5.3.1 Separation of Signal Lines
If a signal cable is near a power cable, noise may be induced. The
signal cables must be separated from the power cables when routed.
When power and signal cables cannot possibly be separated from
each other, the cables must be run in parallel in the minimum distance.
When a conduit is used, it is recommended that the signal cables be
separated from the power cables in it.
[Types of cables]
Group Signal type Action
Amplifier input power line
Motor power line
A
Magnetic contactor driving coil
(Note 3)
Separate binding (Note 1) or
electromagnetic shielding (Note 2)
is necessary for group B cables.
Cable between CNC and SPM
Cable for position feedback or
velocity feedback
Cable for Positioncoder
B
Other cable related to sensor
Separate binding or
electromagnetic shielding is
necessary for group A cables. All
cables must be shielded.
NOTE
1 The groups must be 10 cm or more apart from one
another when binding the cables in each group.
2 The electromagnetic shield refers to shielding
between groups with grounded steel plates.
3 Attach a noise suppressor such as a spark killer to
the magnetic contactor driving coil.
Cabinet
Group A
Group B
Cover
Section
To
operator's
panel,
motor, etc.
Cable of group A
Duct
Cable of
group B
Servo
amp.
Control unit
Spindle
amp.