Rosemount 3051, Quick Installation Manual

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Quick Installation Guide
00825-0100-4051, Rev BA
June 2009
Rosemount 3051
10
S
TEP
4
CONTINUED
...
Power Supply
The dc power supply should provide power with less than two percent ripple. The total
resistance load is the sum of the resistance of the signal leads and the load resistance of
the controller, indicator, and related pieces. Note that the resistance of intrinsic safety
barriers, if used, must be included.
Figure 7. Load Limitation
Maximum Loop Resistance =
43.5 * (Power Supply Voltage – 10.5)
The HART communicator requires a minimum loop
resistance of 250

for communication.
Voltage (V dc)
Load (Ohms)
Operating
Region
1387
1000
500
0
10.5 20 30
42.4
4051 RevBA.fm Page 10 Monday, June 22, 2009 3:15 PM