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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 5.5mm2 or more. Do not share 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
Converter A | G |
| X |
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terminal | B | E |
| Y | FG |
block |
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Shield twisted |
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| Grounding terminal |
Input signal |
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cable |
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| Excitation cable |
Shield twisted |
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| Grounding terminal |
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| G |
| E | Converter |
| A | B | X | Y | terminal |
| block | ||||
(100 ohm or less
Figure 4.11 (a) ground resistance)
Wiring between Detector and Converter (For grounding the detector, see Figure 4.12 below.)
Converter | A | G | X |
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terminal | B | E | Y | FG |
block |
Shield twisted
Grounding terminal
(100 ohm or less
ground resistance)
Input signal |
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cable | Excitation cable |
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Shield twisted
Grounding terminal
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| G |
| E | Converter | ||
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| terminal |
| A | B | X |
| Y | block |
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Figure 4.11 (b)
Wiring between Detector and Converter (when grounidng of the detector is difficut)
Conductive material piping Example: Metal, etc.
Example: Resin product or metal piping whose inside is resin lined
Grounding terminal
Grounding
wire
•If the piping material is conductive, connect the grounding wires to the both ends of the piping flange.
Grounding terminal
Grounding wire
(100 ohm or less ground resistance)
•If the piping material is
Figure 4.12 Grounding the LF414 Type Detector
