Omron NX701-1620, Руководство пользователя

Страница: 139 / 168

4 - 49
4 Installation and Wiring
NX-series CPU Unit Hardware User’s Manual (W535)
4-5 Co
ntro
l Panel In
stalla
tion
4
4-
5-6 Gro
unding
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 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.
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.
 Daisy Chain
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 using a daisy-chain topology 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
10 m min.
PLC
Control panel
Other device NX-series CPU Units NX-AUX01
A device that could be
a noise source
Hub
PLC
Control panel
Other device NX-series CPU Units NX-AUX01
A device that could be
a noise source