Ground Wiring; Figure 3-2 Grounding Wiring - Hitachi SD.LINK User Manual

3 MOUNTING AND WIRING

3.3 Ground Wiring

Carry out ground wiring as shown in Figure 2-2 by following these steps:
① Connect the FG terminals of the power supply module, CPU module and option modules by
crossover wiring to the mount base's grounding seat, a hexagon nut fitted to the mount base
FG terminal (with a wire diameter of 2.0 mm
• The SD.LINK module (LQE530) does not have an FG terminal.
• For information about other option modules, refer to the manuals supplied with the
modules. (Some option modules do not have an FG terminal.)
② Wire the mount base FG terminal to the PCs unit grounding point of the enclosure in which
the mount base is housed (with a wire diameter of 2.0 mm
③ Perform Class D grounding* from the PCs unit grounding point of the enclosure using a wire
with a wire diameter of 5.5 mm
2.0 mm
* Class D grounding is defined in the Technical Standard for Electrical Facilities of Japan. This
standard states that the grounding resistance must be 100 ohms or less for equipment operating
on 300 VAC or less, and 500 ohms or less for devices that shut down automatically within 0.5
seconds when shorting occurs in low tension lines.
2
or more.
2
or more

Figure 3-2 Grounding Wiring

2
or more).
2
or more).
FG terminal to each
individual module
Enclosure's PCs unit
grounding point
To mount base
FG terminal
Class D grounding
3-4
Mount base
FG terminal
2
2.0 mm or more
2
5.5 mm or more