Toshiba LF620F Instruction Manual page 29

(2) Grounding the LF622F type
LF622F
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
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
Converter
terminal
B E
block
Shield twisted
Input signal
cable
Shield twisted
NOTE: Please refer to instruction
manual of detector
connection to detector.
Figure 5.4 (a)
Wiring between Detector and Converter (For
grounding the detector, see Figure 5.5 below.)
Conductive material piping
Example: Metal, etc.
Grounding terminal
Grounding
• If the piping material is conductive, connect the
grounding wires to the both ends of the piping flange.
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2
or more. Do not share a grounding wire with other instruments
X
FG
Y
Grounding terminal
(100 ohm or less
ground resistance)
Excitation cable
Grounding terminal
Detector
terminal
block
about
(100 ohm or less
ground resistance)
wire
Figure 5.5 Grounding the Separate Type Detector
Converter
terminal
block
Shield twisted
Input signal
cable
Shield twisted
NOTE: Please refer to instruction
manual
connection to detector.
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 wire
• If the piping material is non-conductive, perform grounding
resistance 100Ω or less.
－ 28 －
6 F 8 A 0 9 2 8
A G X
FG
B E Y
(100 ohm or less
ground resistance)
Excitation cable
Detector
terminal
of detector about
block
Figure 5.4 (b)
Grounding wire
Grounding terminal
Grounding terminal
(100 ohm or less
ground resistance)