3-5
Section
Noise Precautions
38
2. Always ground to 100
Ω
or less.
3. Always use a separate ground. Never use the same ground as for inverters
or other drive system devices.
3-4-1 Ground Wire Connection
The network can be grounded by inserting the ground wire into the same hole as
the communications cable’s shield wire, as shown in the following diagram.
Ground wire
The network can be grounded by inserting the ground wire into one of the T-
branch Tap connectors, as shown in the following diagram.
Ground wire
3-5
Noise Precautions
General Precautions
To prevent inductive noise, do not wire the communications line, SYSMAC pow-
er lines and power lines near to each other. In particular, be sure to keep the pow-
er lines for inverters, motors, regulators, and contactors at least 300 mm away
from both the communications lines and the SYSMAC power lines. Also, provide
separate conduits or ducts for the communications lines and power lines.
Power line
Communications line
SYSMAC I/O Line
Suspended duct
Floor duct
Control cable
SYSMAC Power Line
General control circuit line
Power cable
Power line
Shielding
Ground (100
Ω
max.)
300 mm
max.
Low-voltage cable
Communications cable
300 mm
max.
Communications line
SYSMAC I/O Line
Do not install communications lines and SYSMAC Power Lines onto the control
panel on which high-voltage devices are mounted.
Grounding from a
Connector
Grounding from a
T-branch Tap