Toshiba GF632 - Manual (Page 27)

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(2) Grounding of the GF632 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 100ohm or lower).
Use grounding wire material of IV wire 5.5mm
2 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
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
B E Y FG
B E Y
A G X
Figure 4.15 Grounding the GF632 Type Detector
A G X
B E Y FG
B E Y
A G X
• In the case that the piping is conductive material, connect the
ground cable to the both ends of the piping flange as needed.
• In the case that the piping is non-conductive material, use
grounding rings.
Grounding terminal
Input signal
cable
Excitation cable
Grounding terminal
Converter
terminal
block
(100 ohm or less
ground resistance)
(100 ohm or less
ground resistance)
Grounding terminal
Input signal
cable Excitation cable
Converter
terminal
block
Shield twisted Shield twisted
Grounding terminal
(100 ohm or less
ground resistance)
Shield twisted
Shield twisted
Detector
terminal
block
Detector
terminal
block
Figure 4.14 (a)
Wiring between Detector and Converter (For
grounding the detector, see Figure 4.13 below.)
Figure 4.14 (b)
Wiring between Detector and Converter (when
grounidng of the detector is difficult)
Grounding wire
Grounding terminal
Conductive material piping
Example: Metal, etc. Non-conductive material piping
Example: Resin product or metal piping whose inside is resin lined
Separate
Grounding terminal
(100 ohm or less ground resistance)
Grounding
ring
(100 ohm or less ground resistance)
Ground
cable
Ground the FG terminal or grounding terminal of the converter. Ground the FG terminal or grounding terminal of the converter.