39
Reference Manual
00809-0100-4772, Rev FA
Installation
March 2016
Installation
3.6.3 FOUNDATION
™
Fieldbus transmitter power requirement
3.6.4 Power conditioning
Each fieldbus power supply requires a power conditioner to decouple the power supply
output from the fieldbus wiring segment.
3.6.5 Field wiring
All power to the transmitter is supplied over the segment wiring. Use shielded, twisted pair
for best results. For new installations or to get maximum performance, twisted pair cable
designed especially for fieldbus should be used. Table 3-5 lists the cable characteristics and
ideal specifications.
Table 3-5. Ideal Cable Specifications for Fieldbus Wiring
Note
The number of devices on a fieldbus segment is limited by the power supply voltage, the
resistance of the cable, and the amount of current drawn by each device.
Transmitter wiring connection
Note
Users should follow local wiring practices and codes when installing the transmitter.
To make the transmitter wiring connection, remove the FIELD TERMINALS end cover on the
electronics housing. Connect the power leads to the positive (+) and negative (–) terminals.
9–30 Vdc/18 mA I.S. INSTALLATIONS
9–17.5 Vdc/18 mA FISCO
9–32 Vdc/18 mA ALL OTHERS
Improper supply voltage can damage the transmitter. Do not exceed 32 Vdc at the
transmitter terminals. Do not apply alternating current line voltage to the transmitter
terminals.
Characteristic Ideal specification
Impedance 100 Ohms ± 20 % at 31.25 kHz
Wire size 18 AWG (0,8 mm
2
)
Shield coverage 90 %
Attenuation 3 db/km
Capacitive unbalance 2 nF/km
See “Safety Messages” on page 2-1 for complete warning
To Next Page
Loading...
