
B-64223EN/01 CONNECTION 4.CONNECTION TO PERIPHERAL
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4.11.3 Electrical Noise Countermeasures
Separating signal lines
Ethernet cable wires belong to group C. See descriptions elsewhere
for explanations about how to separate them from wires in group A or
B.
Group Signal line Action
Primary AC power line
Secondary AC power line
AC/DC power lines
(containing the power lines for
the servo and spindle motors)
AC/DC solenoid
A
AC/DC relay
Bind the cables in group A
separately (Note 1) from groups B
and C, or cover group A with an
electromagnetic shield (Note 2).
Connect spark killers or diodes
with the solenoid and relay.
DC solenoid (24VDC)
DC relay (24VDC)
DI/DO cable between the I/O
unit and power magnetics
cabinet
DI/DO cable between the I/O
unit and machine
B
24-VDC input power cables
connected to the control unit
and its peripherals
Connect diodes with DC solenoid
and relay.
Bind the cables in group B
separately from group A, or cover
group B with an electromagnetic
shield.
Separate group B as far from
Group C as possible.
It is more desirable to cover
group B with the shield.
Cable between the CNC and
I/O Unit
Cable for position and velocity
feedback
Cable between the CNC and
spindle amplifier
Cable for the position coder
Cable for the manual pulse
generator
Cable between the CNC and
the MDI (Note 3)
RS-232C and RS-422
interface cable
Cable for the battery
C
Other cables to be covered
with the shield
Bind the cables in group C
separately from group A, or cover
group C with an electromagnetic
shield.
Separate group C as far from
Group B as possible.
Be sure to perform shield
processing in Section 3.4.
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 The shield is not required when the cable between
the CNC and MDI is shorter than 30 cm.