Hub
CK3M-series Programmable Multi-Axis Controller
NX-series CPU Unit
A device that could
be a noise source
Control panel Other device
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
Independent ground
Insulating material
Channel base
• 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.
Shielded Cable Ground
Controller
Output
Common
Input
Common
4 Installation
4-29
CK3M-series Programmable Multi-Axis Controller User's Manual Hardware (O036)
4-4 Control Panel Installation
4
4-4-6 Grounding
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