Emerson Rosemount 1151, Quick Installation Manual

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Quick Installation Guide
00825-0100-4593, Rev BA
July 2009
Rosemount 1151
8
S
TEP
3
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 2. Load Limitation
Code V
min
V
max
R
min
R
max
R
L
at Supply Voltage (V
S
)
S
(1)
(1) A minimum of 250

is required for communication.
12 45 0 1650 R
L
= 43.5 (V
S
– 12)
R
max
R
L
R
min
V
min
V
S
V
max
Operating
Region
4593_Rev_BA.fm Page 8 Friday, August 7, 2009 3:38 PM