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Chapter 15: Appendix
15-7 Grounding the FL-net system
[1] Outline of the grounding procedures for the FL-net system
This section uses an example of how to ground an FL-net controller control panel when attaching the
control panel to the steel frame of a building.
In order to ground the control panel to a building frame, the following conditions need to be satisfied. If
the ground cannot meet the conditions below, provide an exclusive class D ground for the controller.
1. All of the steel frames must be welded to each other.
2. Class D grounding standards must be met between the controller ground and the steel frame.
3. No strong electrical current should flow through the ground terminal on the controller.
4. Keep a distance of 15 m or more between the controller ground point and any ground for a high
current electrical power panel.
An example of how to ground a control panel: 1 (grounded to the steel frame of a building)
15
Control
Contact point on
panel
the steel frame
Keep a distance of 15 m or more
Control
panel
Contact point on
PLC etc.
the steel frame
An example of how to ground a control panel: 2 (exclusive class D ground)
Building's steel frame
Steel frame of
a building
15-58
High current
panel
High current
panel
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