4-26
4-3 Wiring Conforming to EMC Directives
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
4
System Design
Control Panel Structure
Openings in the control panel, such as holes for cables, panel mounting holes, and gaps
around the door, may allow electromagnetic waves into the panel. To prevent this, observe the
recommendations described below when designing or selecting a control panel.
Case Structure
 Use a metal control panel with welded joints at the top, bottom, and sides so that the surfaces are
electrically conductive.
 If assembly is required, strip the paint off the joint areas (or mask them during painting), to make
them electrically conductive.
 The panel may warp and gaps may appear when screws are tightened. Be sure that no gaps
appear when tightening screws.
 Do not leave any conductive part unconnected.
 Ground all units within the case to the case itself.
Door Structure
 Use a metal door.
 Use a water-draining structure where the door and case fit together, and leave no gaps. (Refer to
the diagrams.)
 Use a conductive gasket between the door and the case. (Refer to the diagrams.)
 Strip the paint off the sections of the door and case that will be in contact with the conductive
gasket (or mask them during painting), so that they are electrically conductive.
 The panel may warp and gaps may appear when screws are tightened. Be sure that no gaps
appear when tightening screws.
Case
Door
Control Panel
Door (Interior Side)
A
B
A-B Cross-section Diagram
Oil-resistant gasket
Conductive gasket
Door side
Oil-resistant gasket Conductive gasket
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