Grounding - Omron CK3W-GC 00 Series Hardware User Manual

4 Installation
High-voltage power panel
Power lines
200 mm
Controller
Example: Separating Controller from Power Lines
 Other Precautions
• Digital I/O Units have both plus and minus commons, so pay attention to the polarity when wir-
ing.
4-4-6

Grounding

This section describes the earthing methods and precautions.
Considerations for Earthing Methods
Local potential fluctuations due to lightning or noise from power devices will cause potential fluctua-
tions between ground terminals of devices. This potential fluctuation may result in device malfunction
or damage. To prevent this, it is necessary to suppress the occurrence of a difference in electrical po-
tential between ground terminals of devices. You need to consider the earthing methods to achieve
this objective
The recommended earthing methods for each usage condition are given in the following table.
Specifications of communications
cables for EtherCAT and Ethernet
The cable shield connected to the con-
nector hood at both ends of the com-
munications cable
Additional Information
• In countries or regions where earthing methods are 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 about
the environmental resistance of the Ethernet switches to be used, the grounding between
Ethernet switches, and the specifications of cables.
4-26
Power
lines
Controller
200 mm
Equipotential
bonding sys-
tem
Recommended
CK3M-series Programmable Multi-Axis Controller User's Manual Hardware (O036)
Metal tubing
Ground to 100 Ω or less
Earthing methods
Star earthing
Connecting Connecting
devices and devices and
noise sources noise sources
to separate to a common
earth electro- earth elec-
des
Recommended Not recom-
mended
Daisy Chain
trode
Not recom-
mended