ABB NGC8206, Руководство пользователя

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2101510 Rev. AG Page 2–17
2.4 Grounding the NGC
The NGC8206 must be properly grounded. The NGC has a grounding lug on the
mounting neck of the enclosure. This lug should be tied to a good earth ground
with no smaller than 12 AWG wire. The NGC8206 cannot be connected to any
pipeline where cathodic protection exists. If the system uses cathodic protection,
the NGC must be mounted on a section of pipe that has been electrically isolated
from the cathodic currents (see
Figure 2-16 ).
Figure 2-16 NGC Grounding Considerations
ANTENNA
P
.S
.
ISOLATED
OUTPUT
RADIO
12
VDC
(+)
GND
(ISOLATED
)
J
1
(+)
J
1
(-
)
TX RX
J
9
-Rx
J
9
-Tx
STREAM
1
SAMPLE
PROBE
STREAM
2
SAMPLE PROBE
1
/8
"
DIELECTRIC ISOLATORS
J
9
-GND
SHLD
GND
RXD
TXD
12
VDC
(+)
ADDITIONAL EQUIPMENT
(i
.e
.
PRESSURE TRANSDUCER
)
12
VDC
(+)
SHLD ARE LEFT FLOATING
NGC TERMINATION PANEL
GND
(ISOLATED
)
GND
(ISOLATED
)
CATHODIC
ISOLATORS
NGC
8200
6770
ENCLOSURE
GND
STREAM
2
DOES NOT HAVE
CATHODIC ISOLATORS SO WE’VE
PUT ISOLATORS IN THE SAMPLE
LINE
.
6770
ENCLOSURE
SOLAR PANEL