Grounding; Replacing Modules; Figure 1-4 Grounding - Hitachi S10mini OD.RING Hardware Manual

1 BEFORE USE

1.3 Grounding

In frame ground (FG) cabling, connect the FG terminal of each module with
external terminals to the cubicle ground connection of the mount base. Apply
Class D grounding from the cubicle ground connection of the mount base.
Use a ground wire whose diameter is 2 mm2 or larger.

1.4 Replacing Modules

Be sure to turn off the power supply when replacing the optional module.
Failure to observe this rule may destroy software.
* 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 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.

Figure 1-4 Grounding

Grounding terminal
Grounding terminal
Class D grounding*
REQUIREMENT
CAUTION
1-4
Mount base