Toshiba GF630 Instruction Manual page 29

(2) Grounding of the GF632 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 100ohm or
lower). Use grounding wire material of IV wire 5.5mm
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.)
Ground the FG terminal or grounding terminal of the converter.
A G
Converter
terminal
B E
block
Shield twisted
Input signal
cable
Shield twisted
G
A B
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
grounding 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
E
Converter
terminal
X Y
block
(100 ohm or less
ground resistance)
Conductive material piping
Example: Metal, etc.
Grounding wire
Grounding
cable
(100 ohm or less ground resistance)
Figure 4.15 Grounding the GF632 Type Detector
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 difficut)
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.
− ２８ −
６Ｆ８Ａ０８８２
2
or more. Do not share a grounding
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 4.14 (b)
Grounding
rings
(100 ohm or less ground resistance)
Grounding terminal
Grounding terminal
Grounding wire