Emerson Fisher FIELDVUE DVC6000f, Instruction Manual

Page: 84 / 384

DVC6000f Digital Valve Controllers
December 2009 4-24
Pressure Tuning
(TB
>
Configure/Setup
>
Detailed Setup
>
Response
Control
>
Pressure Tuning)
WARNING
Changes to the tuning set may cause
the valve/actuator assembly to stroke.
To avoid personal injury or property
damage caused by moving parts,
keep hands, tools, and other objects
away from the valve/actuator
assembly.
Pressure Tuning Set
There are twelve Pressure Tuning Sets
(PRESS_TUNING_SET [42.11]) to choose from. Each
tuning set provides a preselected value for the digital
valve controller gain settings.
Tuning set B provides the slowest response and M
provides the fastest response. Tuning set B is
appropriate for controlling a pneumatic positioner.
Table 4-9 lists the proportional gain, pressure
integrator gain and minor loop feedback gain values
for preselected tuning sets.
Note
When selecting a tuning set for a
DVC6015, DVC6025 or DVC6035 remote
mount unit, it may be necessary to
reduce the tuning set, due to the
effects of the long tubing between the
digital valve controller and the
actuator.
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).
Table 4-9. Gain Values for Preselected Pressure Tuning Sets
Tuning
Set
Pressure
Proportional Gain
Pressure
Integrator
Gain
Pressure 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
Note
Use Expert tuning only if standard
tuning has not achieved the desired
results.
Stabilize/Optimize may be used to
achieve the desired results more
rapidly than Expert tuning.
Pressure Proportional Gain
Pressure Proportional Gain (PRESS_PROP_GAIN
[47.3]) is the proportional gain for the pressure control
tuning set. Changing this parameter will also change
the tuning set to Expert.
Pressure MLFB Gain
Pressure MLFB Gain (PRESS_MLFB_GAIN [47.11])
is the minor loop feedback gain for the pressure
control tuning set. Changing this parameter will also
change the tuning set to Expert.
Pressure Integral Gain
Pressure Integral Gain (PRESS_INTEG_GAIN [47.4])
(also called reset) is the ratio of the change in output
to the change in input, based on the control action in
which the output is proportional to the time integral of
the input. Changing this parameter will also change
the tuning set to Expert.
Pressure Integral Dead Zone
Pressure Integral Dead Zone
(PRESS_INTEG_DEADZ [47.6]) is a window around
the Primary Setpoint in which the integral action is
disabled. The dead band is configurable from 0 to 2%.
4