Toshiba LF664 Instruction Manual page 24

(2) Grounding of the LF664 type
Ground the external grounding terminal of the detector and the FG terminal of the
converter (or external grounding terminal of the converter) securely (grounding resistance
100Ω or lower). Use grounding wire material of IV wire 5.5mm
LF622F
a grounding wire with other instruments where grounding current may flow. (An
independent grounding is preferable.)
If it is difficult to perform grounding work at the detector side because of a pit installation
or other reasons, use a 3-core cable for the excitation cable and connect the E terminal of
the detector to the E terminal of the converter. (The E terminal of the converter is internally
connected with the FG terminal and the converter case.)
A G X
Converter
terminal
B E Y
block
Shield twisted
Input signal
cable
Shield twisted
G
A B X
Figure 4.12 (a)
Wiring between Detector and Converter (For
grounding the detector, see Figure 4.13 below.)
Conductive material piping
Example: Metal, etc.
Grounding terminal
• If the piping material is conductive, connect the
grounding wires to the both ends of the piping flange.
FG
Grounding terminal
(100 ohm or less
ground resistance)
Excitation cable
Grounding terminal
Converter
terminal
E
block
Y
(100 ohm or less
ground resistance)
Grounding
wire
Figure 4.8 Grounding the LF664 Type Detector
—
23
Converter A
terminal
B
block
Shield twisted
Input signal
cable
Shield twisted
G
A B
Wiring between Detector and Converter
(when grounidng of the detector is difficut)
Non-conductive material piping
Example: Resin product or metal piping whose inside is resin lined
Grounding terminal
• If the piping material is non-conductive, perform grounding
resistance 100Ω or less.
—
６Ｆ８Ａ０９４３
2
or more. Do not share
G X
E Y FG
Grounding terminal
(100 ohm or less
ground resistance)
Excitation cable
Grounding terminal
Converter
terminal
E
block
X Y
Figure 4.12 (b)
Grounding wire
grounding resistance
100Ω or less