Endress+Hauser RID16, Руководство по эксплуатации

Страница: 13 / 58

RID16 Wiring
Hauser 13
4.2 Connection to the FOUNDATION Fieldbus™
Devices can be connected to the FOUNDATION Fieldbus™ in two ways:
• Connection via conventional cable gland
→
Chap. 4.2.1
• Connection via fieldbus connector (optional, can be purchased as an accessory)
→
Chap. 4.2.2
"
Caution!
• Switch off power supply before installing or connecting the field indicator. Failure to observe this
may result in destruction of parts of the electronics.
• Grounding via one of the grounding screws is recommended.
• Risk of damaging the fieldbus cable!
– If the shielding of the fieldbus cable is grounded at more than one point in systems without
additional potential matching, power supply frequency equalizing currents can occur that
damage the cable or the shielding. In such cases the shielding of the fieldbus cable is to be
grounded on only one side, i.e. it must not be connected to the ground terminal of the housing.
The shield that is not connected should be insulated!
– We recommend that the fieldbus not be looped using conventional cable glands. If you later
replace even just one measuring device, the bus communication will have to be interrupted.
4.2.1 Cable glands or entries
!
Note!
Please also observe the general procedure on
→
ä
10.
a0012567
Fig. 9: Connection to the FOUNDATION Fieldbus™ fieldbus cable
A FF terminals - fieldbus communication and power supply
B Inner ground terminal (only aluminum housing)
C Outer ground terminal
D Shielded fieldbus cable (FOUNDATION Fieldbus™)
!
Note!
• The terminals for the fieldbus connection (1+ and 2-) are not polarity sensitive.
• Conductor cross-section:
– Max. 2.5 mm
2
for screw terminals
• A shielded cable must be used for the connection.