Chapter 2 Installation
(2) Grounding connection between base
PS
Basic unit
FG
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 2mm2 or larger wire in shortest possible
distance.
•Use a dedicated ground for the control circuit, and keep the ground cable away from that for
•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
16 | Computer module C2PU37 User’s Manual |