Omron CK3M Seres Hardware User Manual page 176

4 Installation
NX-series CPU Unit
Control panel
Precautions for Grounding
 General Precautions
• To prevent electrical shock, do not connect devices to ground poles (or steel frames) with non-
equalized potential to which multiple devices are connected.
• Use a ground pole as close to the Controller as possible and keep the ground line as short as
possible.
• If the same ground is used for both the signal lines and the enclosure, isolate the channel base
(a metal plate inside a grounded control panel) with an insulating material.
Example: Insulating and Grounding an Enclosure
• If high-frequency equipment is present, then ground not only the high-frequency equipment but
also the panel itself in which the Controller is housed.
• As shown in the following diagram, when using shielded cable for I/O wiring, connect the shield
near the Controller to the enclosure ground terminal.
Follow the instructions in the Communications Unit manual for preparing shielded communica-
tions cables.
4-30
CK M-series Programmable Multi-Axis Controller
Other device
Hub
Insulating material
Channel base
Controller
Input Output
Common Common
Shielded Cable Ground
CK3M/CK5M Series Programmable Multi-Axis Controller Hardware User's Manual (O036)
A device that could
be a noise source