User instructions - Digital Positioner 3200MD LGENIM0059-01 10/08
15
7.3 Operation of Configuration
DIP Switch Settings
The first 7 Dip Switches are for basic configuration
Air Action
This must be set to match the configuration of the valve/actuator
mechanical tubing connection and spring location since these deter-
mine the air action of the system.
ATO (air-to-open)
Select ATO if increasing output pressure from
the positioner port 1 is tubed so it will cause the valve to open.
ATC (air-to-close)
Select ATC if increasing output pressure from
the positioner port 1 is tubed so it will cause the valve to close.
Signal at Closed
Normally this will be set to 4 mA for an Air-to-open actuator, and
20 mA for an Air-to-close actuator configuration.
4 mA Selecting 4 mA will make the valve fully closed when the
signal is 4 mA and fully open when the signal is 20 mA.
20 mA Selecting 20 mA will make the valve fully closed when
the signal is 20 mA and fully open when the signal is 4 mA.
Figure 9: Default Custom Characterization
$POUSPM$PNNBOE
$PNNBOE
Pos. Characterization
Linear Select if the actuator position should be directly
proportional to the input signal. (Due to their inherent =% char-
acteristics, this setting give an =% Cv characteristic for most
rotary valves.)
Optional Select if another characteristic is desired, which is set
in conjunction with the next switch, labeled Optional Pos. Char.
Optional Pos. Characterization
If the Pos. Characterization switch is set to optional then this switch
is active with the following options:
The =% option will characterize the actuator response to the input
signal based on a standard 30:1 equal percent rangability curve
Custom If Custom is selected, the positioner will be charac-
terized to a custom table that must be set-up using a properly
configured HART 275 handheld or other host software. The
Default setting for this curve is modified quick open. ( also used
for a linear Cv characteristic for most rotary valves)
Table VIII: Characteristic Curve Data
% Command
% Control Command
=% Linear Custom
0 0 0 0
5 0.62 5 8.66
10 1.35 10 16.24
15 2.22 15 23.17
20 3.25 20 30.11
25 4.47 25 35.31
30 5.91 30 40.51
35 7.63 35 45.42
40 9.66 40 50.34
45 12.07 45 54.40
50 14.92 50 58.47
55 18.31 55 62.39
60 22.32 60 66.31
65 27.08 65 70.27
70 32.71 70 74.23
75 39.40 75 78.17
80 47.32 80 82.11
85 56.71 85 85.50
90 67.84 90 88.89
95 81.03 95 94.45
100 100.00 100 100.00
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