Emerson Rosemount 5408 Краткое руководство по эксплуатации - Страница 11
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October 2017
6.0
Prepare the electrical connections
Cable selection
Use 24-14 AWG wire. Twisted pairs and shielded wiring are recommended for
environments with high EMI (electromagnetic interference).
Two wires can be safely connected to each terminal screw.
Cable gland/conduit
For explosion-proof/flameproof installations, only use cable glands or conduit
entry devices certified explosion-proof or flameproof.
Power supply
The transmitter operates on 12-42.4 Vdc (12-30 Vdc in Intrinsically Safe
installations) at the transmitter terminals.
Power consumption
Max. 1 W, current max. 23 mA
Load limitations
For HART
Maximum loop resistance is determined by the voltage level of the external
power supply, as described by
Figure 2. Load Limitations
1400
1200
1000
800
600
400
200
0
communication, a minimum loop resistance of 250 is required.
®
Maximum Loop Resistance = 43.5 * (External Power Supply Voltage - 12)
1322
782
521
250
12
External Power Supply Voltage (Vdc)
Figure
2.
17.8
24
20
30
Quick Start Guide
42.4
40
50
11