Toshiba 2000 user manual Installation Grounding connection between base

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 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.

16 Computer module C2PU37 User’s Manual