Hitachi S10mini User Manual page 293

Figure 8-75 Controller Control Panel Grounding Method 2
8.7.2 Power supply wiring and grounding
For the explanation of the FL-net system's power supply wiring and grounding, the example in
Figure 8-76 indicates the power supply wiring and grounding of the distribution switchboard and
controller panel.
When making power supply wiring and ground connections, observe the following instructions:
• With an insulating transformer with a static shield, provide insulation between the control power
supply and controller power supply.
• Provide Class D grounding for the frames of the distribution switchboard and controller control
panel.
• Do not connect the controller's FG (frame ground) terminal to the frame of the control panel.
Provide the controller with dedicated Class D or higher grounding.
• Minimize the length of the controller input power supply wiring. Use twisted wiring for the
controller input power supply.
• Connect the controller LG (line ground) terminal to the shield terminal on the insulating
transformer and then to the panel's frame ground.
Control
panel
Steel frame
grounding point
PLC, etc.
(Controller's Dedicated Class D Grounding)
Building's
steel frame
8-69
8 APPENDIXES
High-
voltage
circuit panel