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Toshiba LF414 Instruction Manual page 30

Electromagnetic flowmeter detector
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(2) Grounding of the LF414 type
Separate
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
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
Converter
terminal
B
E
block
Shield twisted
Input signal
cable
Shield twisted
G
A B
Figure 4.11 (a)
Wiring between Detector and Converter (For
grounding the detector, see Figure 4.12 below.)
Grounding terminal
• If the piping material is conductive, connect the
grounding wires to the both ends of the piping flange.
X
Y
FG
Grounding terminal
(100 ohm or less
ground resistance)
Excitation cable
Grounding terminal
E
Converter
terminal
X
Y
block
(100 ohm or less
ground resistance)
Conductive material piping
Example: Metal, etc.
Grounding
wire
Figure 4.12 Grounding the LF414 Type Detector
2
or more. Do not share a grounding wire with
Converter
terminal
block
Shield twisted
Input signal
cable
Shield twisted
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.
- 29 -
6F8A0870
A
G
X
B
E
Y
FG
(100 ohm or less
ground resistance)
Excitation cable
G
E
Converter
terminal
A B
X
Y
block
Figure 4.11 (b)
Grounding wire
(100 ohm or less ground resistance)
Grounding terminal
Grounding terminal

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