Toshiba GF632 Instruction Manual page 27

(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).
Separate
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.)
Ground the FG terminal or grounding terminal of the converter.
A G
Converter
terminal
B
E
block
Shield twisted
Input signal
cable
Shield twisted
B E
A G
Figure 4.14 (a)
Wiring between Detector and Converter (For
grounding the detector, see Figure 4.13 below.)
Grounding terminal
• In the case that the piping is conductive material, connect the
ground cable to the both ends of the piping flange as needed.
X
Y FG
Grounding terminal
(100 ohm or less
ground resistance)
Excitation cable
Grounding terminal
Detector
Y
terminal
block
X
(100 ohm or less
ground resistance)
Conductive material piping
Example: Metal, etc.
Ground
cable
(100 ohm or less ground resistance)
Figure 4.15 Grounding the GF632 Type Detector
2
or more. Do not share a grounding wire with
Ground the FG terminal or grounding terminal of the converter.
Converter
terminal
block
Shield twisted
Input signal
cable
Shield twisted
Wiring between Detector and Converter (when
grounidng of the detector is difficult)
Non-conductive material piping
Example: Resin product or metal piping whose inside is resin lined
Grounding terminal
• In the case that the piping is non-conductive material, use
grounding rings.
－ ２６ －
６Ｆ８Ａ０８８３
A G X
B E Y FG
(100 ohm or less
ground resistance)
Excitation cable
Detector
Y
terminal
B E
block
A G X
Figure 4.14 (b)
Grounding wire
Grounding
ring
(100 ohm or less ground resistance)
Grounding terminal
Grounding terminal