Toshiba Programmable Controller PROSEC T3 Manual do Utilizador descarregar pdf (Página 72)

4. Installation and Wiring

Grounding of long

distance expansion

Basic unit

Expansion unit

In principle, ground a long-distance expansion unit as shown in the

above figure. If the potential changes at the grounding point,

causing malfunctions of the T3, isolate the expansion unit from the

mounting frame, and ground it with a dedicated cable (2 mnf or

more).

Basic unit

Expansion unit

_____

ili

Ground bar in the panel

2mm=

or more

Isolation

panel

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 the 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.

64 PROSEC T3

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 99 100

Sem comentários

Toshiba Programmable Controller PROSEC T3 Manual do Utilizador Página 72