Connect the ground line of each control panel to the equipotential bonding system.
Information device
Power device
Metal duct and pipe
Building structure
Equipotential bonding conductor
Main earthing terminal
Earth electrode
Metal structure in floor
Earth trunk line
Control panel
Hub
Control panel
Control panel
Noise source
Star Earthing
If the earthing method used for the building is not equipotential bonding or the earthing system is un-
known, choose (a) from the earthing methods given below.
a.
Installation method by connecting devices and noise sources to separate earth electrodes
This is an earthing method to separately ground an earth electrode of the device that is connected
with a communications cable or other devices and an earth electrode of a high-power device that
could be a noise source, such as a motor or inverter. Each earth electrode must be ground to 100
Ω or less.
Connect the ground lines of the device that is connected with a communications cable and other
devices as a bundle to a single earth electrode. Be sure that the earth electrode is separated by a
minimum of 10 m from any other earth electrode of a device that could be a noise source.
Hub
PLC
Control panel Other device Motion Controller
A device that could be
a noise source
10 m min.
4 Mounting and Wiring
4-24
CK3E-series Programmable Multi-Axis Controller User’s Manual Hardware (I610)
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