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24
Reference Manual
00809-0100-2230, Rev CA
July 2017
Grounding - F
OUNDATION
™ fieldbus
Signal wiring of the fieldbus segment must not be grounded. Grounding one of the signal wires will shut
down the entire fieldbus segment.
Shield wire connection
To protect the fieldbus segment from noise, grounding techniques for shield wire usually require a single
grounding point for shield wire to avoid creating a ground loop. The ground point is typically at the
power supply (Rosemount 2410 Tank Hub).
The Rosemount Tank Gauging devices are designed for “daisy-chain” connection of shield wiring in order
to enable a continuous shield throughout the Tankbus network. The shield wire terminal in the
Rosemount 2230 is not connected to ground. It merely provides electrical continuity to daisy-chained
Tankbus cables.
3.4.3
Cable selection
Use shielded twisted pair wiring for the Rosemount 2230 in order to comply with FISCO
(1)
requirements
and EMC regulations. The cables must be approved for use in hazardous areas, where applicable. In the
U.S. explosion-proof conduits may be used in the vicinity of the vessel.
We recommend cable size 0.75 mm
2
(18 AWG) in order to facilitate wiring. Cables within the range 22
AWG to 16 AWG (0.5 t o1.5 mm²)
can be used in order to minimize the voltage drop to the Rosemount
2230 display.
Tankbus cabling must be approved for use in minimum 85°C to match requirements for all devices in a
Rosemount Tank Gauging system.
The FISCO specification requires that cables for the Tankbus comply with the following parameters:
Table 3-1. FISCO cable parameters
3.4.4
Hazardous areas
When the Rosemount 2230 is installed in a hazardous area, national and local regulations and
specifications in applicable certificates must be observed, see
Appendix B: Product Certifications
1,
See IEC 61158-2 and IEC/TS 60079-27:2002.
Parameter
Value
Loop resistance
15
/km to 150
/km
Loop inductance
0.4 mH/km to 1 mH/km
Capacitance
45 nF/km to 200 nF/km
Maximum length of each spur cable
60 m in apparatus class IIC and IIB
Maximum length of each trunk cable
1000 meter in apparatus class IIC and
1900 meter in apparatus class IIB
Summary of Contents for Rosemount 2230
Page 1: ...Reference Manual 00809 0100 2230 Rev CA July 2017 Rosemount 2230 Graphical Field Display ...
Page 2: ......
Page 4: ...ii Reference Manual 00809 0100 2230 Rev CA Title Page July 2017 Title Page ...
Page 16: ...6 Reference Manual 00809 0100 2230 Rev CA Introduction July 2017 Introduction ...
Page 28: ...18 Reference Manual 00809 0100 2230 Rev CA Overview July 2017 Overview ...
Page 44: ...34 Reference Manual 00809 0100 2230 Rev CA Installation July 2017 Installation ...
Page 154: ...144 Reference Manual 00809 0100 2230 Rev CA Index July 2017 Index ...
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