Instruction Manual
D103785X012
Configuration
June 2017
31
Pressure Tuning
D Pressure Tuning Set
There are twelve Pressure Tuning Sets to choose from. Each tuning set provides a preselected value for the digital valve
controller gain settings. Tuning set C provides the slowest response and M provides the fastest response. Tuning set B
is appropriate for controlling a pneumatic positioner. Table 3‐5 lists the proportional gain, pressure integrator gain and
minor loop feedback gain values for preselected tuning sets.
Table 3‐5. Gain Values for Preselected Pressure Tuning Sets
Tuning Set Proportional Gain Integrator Gain Minor Loop Feedback Gain
B
C
D
E
F
G
0.5
2.2
2.4
2.8
3.1
3.6
0.3
0.1
0.1
0.1
0.1
0.1
35
35
35
35
35
34
H
I
J
K
L
M
4.2
4.8
5.6
6.6
7.8
9.0
0.1
0.1
0.1
0.1
0.1
0.1
31
27
23
18
12
12
X (Expert) User Adjusted User Adjusted User Adjusted
In addition, you can specify Expert tuning and individually set the pressure proportional gain, pressure integrator gain,
and pressure minor loop feedback gain. Individually setting or changing any tuning parameter will automatically
change the tuning set to X (expert).
Note
Use Expert tuning only if standard tuning has not achieved the desired results.
Stabilize/Optimize or Performance Tuner may be used to achieve the desired results more rapidly than Expert tuning.
D Proportional Gain—The proportional gain for the pressure control tuning set. Changing this parameter will also
change the tuning set to Expert.
D MLFB Gain—The minor loop feedback gain for the pressure control tuning set. Changing this parameter will also
change the tuning set to Expert.
D Integral Enable—Yes or No. Enable the pressure integral setting to improve static performance by correcting for
error that exists between the pressure target and actual pressure. Pressure Integral Control is disabled by default.
D Integral Gain—Pressure Integral Gain (also called reset) is the gain factor applied to the time integral of the error
signal between desired and actual pressure. Changing this parameter will also change the tuning set to Expert.
Travel/Pressure Integral Settings
D Integral Dead Zone—A window around the Primary Setpoint in which integral action is disabled. This feature is used
to eliminate friction induced limit cycles around the Primary Setpoint when the integrator is active. The Dead Zone
is configurable from 0% to 2%, corresponding to a symmetric window from 0% to +/-2% around the Primary
Setpoint. Default value is 0.25%.
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