Hitachi LQZ700, Руководство пользователя

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3 MOUNTING AND WIRING
3-4
3.3 Ground Wiring
Carry out ground wiring as shown in Figure 3-2 by following these steps:
①
Connect the FG terminals of the power supply module, LPU 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
2
or more).
• The SYS SW module (LQZ700) does not need to 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
2
or more).
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
or more.
FG terminal to each
individual module
Enclosure's PCs unit
grounding point
Class D grounding
5.5 mm
2
or more
2.0 mm
2
or more
2.0 mm
2
or more
To mount base
FG terminal
Mount base
FG terminal
Figure 3-2 Ground Wiring
* 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.