User Guide

Chapter 2 Installation
Computer m
odule C2PU37 User’s Manual
16
(2) Grounding connection between base
FG
PS
Basic unit
PS
Expansion unit
PS
Expansion unit
Board internal ground terminal
Dedicated ground
• Connect the FG terminal of the power supply module to the unit mounting screw,
and to the ground bar in the panel by 2mm
2
or larger wire in shortest possible
distance.
• Use a dedicated ground for the control circuit, and keep the ground cable away
from that for high-power systems.
• 100Ω or less to earth is recommended.
(3) Line Filter ground (LG) terminal
The LG terminal is a neutral point of the primary power supply line filter. It can
suppress the effect caused by the noise from power supply line, by grounding the
LG terminal.
Therefore, normally, ground the LG terminal together with the FG terminal.
However, depending on the power system, leakage current to the ground from the
LG may cause problems. In this case, install an isolated transformer in the power
line, or open the LG terminal. If the unit is installed in isolation, open the LG
terminal.
Do not connect the LG and FG terminals without grounding them.
(4) Frame ground (FG) terminal
The FG terminal is a protective ground point of the model 2000. The FG terminal
voltage is equalized to that of the base. For safety, ground them at single-point in
order to minimize the risk of electrical shock.