5 Installation and Wiring
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NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
Star Earthing
If the earthing method used for the building is not equipotential bonding or the earthing system is
unknown, choose a) from among the earthing methods given below.
a) 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 con-
nected 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 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.
b) Connecting devices and noise sources to a common earth electrode
This is an earthing method to connect the device that is connected with a communications cable,
other devices, and a device that could be a noise source, to a common earth electrode.
This earthing method is not recommended because the device that could be a noise source may
interfere electromagnetically with other devices.
Hub
NX-AUX01
10 m min.
A device that could be
a noise source
NX-series NX1P2 CPU UnitNX-series CPU Unit
Control panel Other device
Hub
NX-AUX01
A device that could be
a noise source
NX-series NX1P2 CPU UnitNX-series CPU Unit
Control panel Other device
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