3-30
•
Wire the noise filter as shown at the left in the following illustration. The noise filter should be installed
at the entrance to the control box whenever possible.
Correct:
Separate input and output
WRONG:
Noise not filtered effectively
AC output
AC input
Ground
AC input
AC output
Ground
•
Use twisted-pair cables for the power supply cables whenever possible, or bind the cables.
Driver
Binding
or
Driver
Correct:
Properly twisted
Correct:
Cables are bound.
•
Separate power supply cables and signal cables when wiring.
H
Control Box Structure
If there are gaps in the control box from cable openings, operating panel installation
holes, gaps around the door, and so on, it may allow electric waves to penetrate. In order
to prevent this from occurring, take the measures described below.
D
Case Structure
•
Construct the control box case of metal, and weld the joints between the top, bottom, and sides so that
they will be electrically conductive.
•
For assembly, strip the paint off of joined areas (or mask them during painting), to make them electri-
cally conductive.
•
If gaps are opened in the control box case when tightening down screws, make adjustments to prevent
this from occurring.
•
Do not leave any conducting part unconnected.
•
Connect to the case all Units inside of the case.
D
Door Structure
•
Construct the door of metal.
•
Use a water draining structure where the door and case fit together, and leave no gaps. (Refer to the
diagrams below.)
•
Use conductive packing between the door and the case, as shown in the diagrams below. Strip the
paint off of the sections of the door and case that will be in contact with the conductive packing (or mask
them during painting), so that they will be electrically conductive.
System Design and Installation
Chapter 3
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