Cable Selection; Hazardous Areas; Power Requirements; Power Budget - Emerson Rosemount 5900 Reference Manual

Rosemount 5900 Series
3.4.3

Cable Selection

Table 3-5. FISCO cable
parameters
3.4.4

Hazardous Areas

3.4.5 Power
Requirements
3.4.6

Power Budget

Table 3-6. Power consumption
for various Raptor devices
3-40
Preliminary
Use shielded twisted pair wiring for the Rosemount 5900 Series in order to
comply with EMC regulations and to ensure good fieldbus performance is
achieved. The cables must be suitable for the supply voltage and approved
for use in hazardous areas, where applicable. In the U.S. explosion-proof
conduits may be used in the vicinity of the vessel.
Use 22 AWG to 18 AWG in order to minimize the voltage drop to the
transmitter.
(1)
The FISCO
Raptor Tankbus comply with the following parameters:
Parameter
Loop resistance
Loop inductance
Capacitance
Maximum length of each spur cable
Maximum cable length including trunk and
spurs
When the Rosemount 5900 level gaugeis installed in hazardous area, local
regulations and specifications in applicable certificates must be observed.
The Rosemount 5900 is powered over the intrinsically safe Tankbus by the
Rosemount 2410 tank communication unit. The 2410 feeds the intrinsically
safe fieldbus segment by acting as a FISCO power supply on the Tankbus.
The Rosemount 2410 tank hub delivers 250 mA to the Tankbus. The number
of tanks served by the 2410 depends on the type of connected field devices
and their power consumption
in Table 3-6 below:
Field device
5900S Radar Level Gauge
5300T or 5400T Series Radar Level
Gauge
Rosemount 2230 Graphical Field
Display
Rosemount 2240S Multi-input
Temperature Transmitter
Rosemount 644 Temperature
Transmitter
Rosemount 3051 Pressure
Transmitter
The Rosemount 2410 tank hub supports a maximum of one tank for a
5900S-based configuration. In a 5300T- or 5400T-based configuration up to
10 tanks are supported.
(1) See also the reference document IEC/TS 60079-27
(2) May be fewer than the 16 devices per segment, stated in the F
dard.
F ™ fieldbus specification requires that cables for the
OUNDATION
(2)
. Power consumption per field device is listed
Power consumption
50 mA
20-25 mA
25 mA
30 mA including MST and WLS
11 mA
17.5 mA
Reference Manual
300520EN, Rev AA
November 2009
Value
15/km to 150/km
0.4 mH/km to 1 mH/km
45 nF/km to 200 nF/km
60 m in apparatus class IIC and IIB
1000 m in apparatus class IIC and 1900 m in
apparatus class IIB
™ fieldbus stan-
OUNDATION
Section 3. Installation