6F8A0917
- 27 -
5.4.3 Grounding
The external ground terminal of the detector and the FG terminal of the converter (or external ground
terminal of the converter) must be grounded securely with Class D grounding (grounding resistance
100
Ω
or less). Use an IV wire 5.5mm
2
or more for grounding wire.
In addition, do not share the grounding wire with other equipment where grounding current may flow.
(An independent grounding is preferable.)
If it is difficult to carry out grounding work at the detector side due to 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
or other reasons as shown in Figure 5.9(b), of the converter. (The E terminal of the converter is
internally connected to the FG terminal and the converter housing.)
A
B
X
G
Y
E
Converter
terminal block
External ground
terminal
Twisting shields
Input signal cable
Twisting shields
Excitation cable
Detector terminal block
A
B
X
G
E
Y
FG
Ground terminal
Class D ground
(Ground resistance 100 or less)
Class D grounding
(Ground resistance 100 or less)
Figure 5.9(a) Wiring between Detector and Converter
