
B-65232EN/03 FANUC AC SERVO AMPLIFIER β series 7.INSTALLATION CONDITIONS AND NOTES
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7.3 NOISE PROTECTION
7.3.1 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.