Control Panel Structure - Omron SMARTSTEP 2 SERIES User Manual

If no-fuse breakers are installed at the top and the power supply line is wired from the lower duct,
use metal tubes for wiring or make sure that there is adequate distance between the input lines
and the internal wiring. If input and output lines are wired together, noise resistance will decrease.
Wire the noise filter as shown at the left in the following illustration. The noise filter must be
installed as close as possible to the entrance of the control box.
Correct: Separate input and output
AC input
1
2
3
Ground
Use twisted-pair cables for the power supply cables, or bind the cables.
Correct: Properly twisted
Separate power supply cables and signal cables when wiring.

Control Panel Structure

Openings in the control panel, such as holes for cables, operating panel mounting holes,
and gaps around the door, may allow electromagnetic waves into the panel. To prevent this from
occurring, observe the items 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 will
be electrically conductive.
If assembly is required, strip the paint off the joint areas (or mask them during painting), to make
them electrically conductive.
If gaps appear in the control box case when screws are tightened, make adjustments to prevent
this from occurring.
Do not leave any conductive part unconnected.
Ground all Units within the case to the case itself.
4-3 Wiring Conforming to EMC Directives
AC output
4
NF
5
6
E
Servo Drive
L1
L3
Wrong: Noise not filtered effectively
AC input
1 4
NF
2 5
3 6
E
Ground
AC output
Correct: Cables are bound.
Servo Drive
Binding
4
L1
L2
L3
4-20