28
Reference Manual
00809-0300-4750, Rev BA
Quick Installation and Start-Up
March 2016
Quick Installation and Start-Up
Analog loop load limitations
Maximum loop resistance is determined by the voltage level of the external power supply,
as described in
Figure 2-29. Wall Mount Transmitter Analog Loop Load Limitations
R
max
= 52.08 (V
ps
– 10.8)
V
ps
= Power supply voltage (Volts)
R
max
= Maximum loop resistance (Ohms)
2.11.6
Powering the transmitter
The transmitter is available in two models. The AC powered transmitter is designed to be
powered by 90—250 VAC (50/60 Hz). The DC powered transmitter is designed to be
powered by 12—42 VDC. Before connecting power to the transmitter, be sure to have the
proper power supply, conduit, and other accessories. Wire the transmitter according to
national, local, and plant electrical requirements for the supply voltage. See
through
.
Figure 2-30. Field Mount Transmitter DC Power Requirements
Peak inrush is 42 A at 42 VDC supply, lasting approximately 1 ms
Inrush for other supply voltages can be estimated with:
Inrush (Amps) = Supply (Volts)/1.0
1000
0
10.8
30
Operating
region
Power supply (Volts)
Load (Ohms)
750
500
250
Supply curre
nt (Amps)
Power supply (VDC)
0.8
1.2
1.0
0.6
0.4
0.2
18
12
24
30
36
42
Summary of Contents for Rosemount 8750W
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Page 168: ...156 Reference Manual 00809 0300 4750 Rev CA Maintenance March 2016 Maintenance ...
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