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Chapter 15: Appendix
15
[2] Wiring power lines and grounding equipment
This section describes how to wire power lines and ground lines in a distribution panel, or controller
panel for the FL-net system.
When wiring power lines and making grounds, observe the precautions below.
1. Isolate the control power circuit from the controller power circuit using an isolation transformer with a
static electricity protective function.
2. Ground the frames of the distribution panel and the control panel using class D grounding.
3. Provide an exclusive class D or better ground to the controller FG (frame ground) terminal. Do not
connect this terminal to the controller frame.
4. The wiring for the power line to the controller should be as short as possible, using twisted power
cables.
5. Connect the LG (line ground) terminal on the controller to the shield terminal on the isolation trans-
former, and then to the frame ground on the panel.
An example of how to ground the FL-net system
Control
power
Distribution
panel
Operation
preparation
Relay circuit
Control panel
PLC, etc.
Panel
ground
Panel ground
(5.5 mm
2
or larger)
Controller ground
(5.5 mm
2
or larger)
Class
D ground
Class
D ground
Class
D ground