FANUC Series 16/18/160/180-Model C Connection Manual (Hardware)

3. INSTALLATION
B–62753EN/01
22
The CNC has been steadily reduced in size using surface–mount and
custom LSI technologies for electronic components. The CNC also is
designed to be protected from external noise. However, it is difficult to
measure the level and frequency of noise quantitatively, and noise has
many uncertain factors. It is important to prevent both noise from being
generated and generated noise from being introduced into the CNC. This
precaution improves the stability of the CNC machine tool system.
The CNC component units are often installed close to the parts generating
noise in the power magnetics cabinet. Possible noise sources into the
CNC are capacitive coupling, electromagnetic induction, and ground
loops.
When designing the power magnetics cabinet, guard against noise in the
machine as described in the following section.
The cables used for the CNC machine tool are classified as listed in the
following table:
Process the cables in each group as described in the action column.
Group Signal line Action
Primary AC power line
Bind the cables in group A sepa-
rately (Note 1) from groups B
Secondary AC power line
ra
t
e
l
y
(N
o
t
e
1)
f
rom groups
B
and C or cover grou
p
A with an
A
AC/DC power lines (containing
the power lines for the servo and
spindle motors)
and
C
,
or
cover
grou
A
with
an
electromagnetic shield (Note 2).
See Section 3.7.4 and connect
s
p
ark killers or diodes with the
AC/DC solenoid
s ark
killers
or
diodes
with
the
solenoid and relay.
AC/DC relay
y
DC solenoid (24VDC)
Connect diodes with DC sole-
noid and relay.
DC relay (24VDC)
Bind the cables in group B sepa-
rately from group A, or cover
gro p B ith an electromagnetic
B
DI/DO cable between the CNC
and power magnetics cabinet
group
B
w
ith
an e
l
ec
t
romagne
ti
c
shield.
Separate group B as far from
G C ibl
DI/DO cable between the CNC
and machine
G
roup
C
as poss
ibl
e.
It is more desirable to cover
group B with the shield.
Cable between the CNC and ser-
vo amplifier
Bind the cables in group C sepa-
rately from group A, or cover
gro p C ith an electromagnetic
Cable for position and velocity
feedback
group
C
w
ith
an e
l
ec
t
romagne
ti
c
shield.
Separate gro p C as far from
Cable between the CNC and
spindle amplifier
S
epara
t
e group
C
as
f
ar
f
rom
Group B as possible.
Btfhild
Cable for the position coder
B
e sure to per
f
orm s
hi
e
ld
pro-
cessing in Section 3 7 5
C
Cable for the manual pulse gen-
erator
cessing
in
Section
3
.
7
.
5
.
Cable between the CNC and the
CRT/MDI
RS–232–C and RS–422 interface
cable
Cable for the battery
Other cables to be covered with
the shield
3.7
ACTION AGAINST
NOISE
3.7.1
Separating Signal
Lines

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