Grounding of longdistance expansion, Installation and wiring – Toshiba Programmable Controller PROSEC T3 User Manual
Page 72
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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
FG
_____
p
'
ili
!
Ground bar in the panel
2mm=
or more
i
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.
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PROSEC T3