Chapter 3
3-29
System Design and Installation
• Use twisted-pair cables for the power supply cables whenever possible, or bind the cables.
• Separate power supply cables and signal cables when wiring.
■ Control Panel Structure
Any gaps in the cable entrances, mounting holes, covers, or other parts of a control
panel can allow electromagnetic waves to leak from or enter the control panel. Observe
the following items for panel design and selection to ensure that electromagnetic waves
cannot leak from or enter the control panel.
● Case Structure
• Use a metal control panel with welded joints on the top, bottom, and all sides. The case must be
electrically conductive.
• When assembling the control panel, remove the coating from all joints (or mask the joints when
coating) to ensure electrical conductivity.
• Be sure that no gaps are created when installing the control panel, as gaps can be caused by dis-
tortion when tightening screws.
• Be sure there are not any electrically conductive parts that are not in electrical contact.
• Ground all Units mounted in the control panel to the panel case.
● Cover Structure
• Use a metal cover.
• Use a water-proof structure, as shown in the following diagram, and be sure there are no gaps.
• Use electrically conductive packing between the cover and the case, as shown in the following dia-
gram. (Remove the coating from the contact points of the packing (or mask the contact points when
coating) to ensure electrical conductivity.)
Driver
Binding
or
Driver
Correct: Properly twisted
Correct: Cables are bound.
L1C
L1
L2
L3
L2C
To Next Page
Loading...
Need help?
General
