Integral Settings; Pressure Tuning - Fisher FIELDVUE DVC6200 Instruction Manual

apparent in the travel response, it can generally
optimize tuning more effectively than manual tuning.
Typically, the performance tuner takes 3 to 5 minutes
to tune an instrument, although tuning instruments
mounted on larger actuators may take longer.

Integral Settings (1-2-2-1-2)

D Integ DeadZ—Integral Dead Zone is 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%.
D Integ Limit—The Integral Limit provides an
upper limit to the integrator output. The high limit is
configurable from 0 to 100% of the I/P drive signal.

Pressure Tuning (1-2-2-1-3)

WARNING
Changes to the tuning set may cause
the valve/actuator assembly to stroke.
To avoid personal injury and property
damage caused by moving parts,
keep hands, tools, and other objects
away from the valve/actuator
assembly.
D Press Tuning Set (1-2-2-1-3-1)
Press 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 B provides the
September 2010
Detailed Setup
Table 4-4. Gain Values for Preselected Pressure Tuning Sets
Tuning Pressure
Set Proportional Gain
B 0.5
C 2.2
D 2.4
E 2.8
F 3.1
G 3.6
H 4.2
I 4.8
J 5.6
K 6.6
L 7.8
M 9.0
X
User Adjusted User Adjusted
(Expert)
slowest response and M provides the fastest
response.
Tuning set B is appropriate for controlling a
pneumatic positioner. Table 4-4 lists the
proportional gain, pressure integrator gain and
minor loop feedback gain values for preselected
tuning sets.
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 and performance
tuner may be used to achieve the
desired results more rapidly than
Expert tuning.
Press Prop Gain—Pressure Proportional Gain is
the proportional gain for the pressure control tuning
set. Changing this parameter will also change the
tuning set to Expert.
Press MLFB Gain—Pressure MLFB Gain is the
minor loop feedback gain for the pressure control
tuning set. Changing this parameter will also
change the tuning set to Expert.
Pressure Pressure
Integrator Minor Loop
Gain Feedback Gain
0.3 35
0.1 35
0.1 35
0.1 35
0.1 35
0.1 34
0.1 31
0.1 27
0.1 23
0.1 18
0.1 12
0.1 12
User Adjusted
37
4