4 - 17
4 Mounting and Wiring
CK3E-series Programmable Multi-Axis Controller Hardware User’s Manual (I610)
4
-6
G
roun
din
g
4
4-6-1
C
onsiderat
ions
f
o
r
Eart
hing M
e
thods
4-6
Grounding
This section describes the earthing methods and precautions.
Local potential fluctuations due to lightning or noise occurred by power devices will cause potential fluc-
tuations between ground terminals of devices. This potential fluctuation may result in device malfunc-
tion or damage.To prevent this, it is necessary to suppress the occurrence of a difference in electrical
potential between ground terminals of devices. You need to consider the earthing methods to achieve
this objective.
The recommended earthing methods are given in the following table.
Additional Information
• In a country or region where the earthing method is regulated, you must comply with the reg-
ulations. Refer to the applicable local and national ordinances of the place where you install
the system, or other international laws and regulations.
• When using Ethernet switches, ask the Ethernet switch manufacturer for information on the
environmental resistance of the Ethernet switch to use, the grounding between Ethernet
switches, or the specifications of cables.
4-6-1
Considerations for Earthing Methods
Specification of communications cables
for EtherCAT and EtherNet
Earthing methods
Equipoten-
tial bonding
system
Star earthing
Daisy chain
Connecting
devices and
noise sources
to separate
earth elec-
trodes
Connecting
devices and
noise sources
to a common
earth electrode
The cable shield connected to the connector
hood at both ends of the communications
cable
Recom-
mended
Recommended
Not recom-
mended
Not recom-
mended