Emerson FIELDVUE DVC6200f, Instruction Manual

Page: 63 / 326

Transducer Block
November 2010 51
Response Control
Travel Tuning
Field Communicator
TB
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Configure/Setup
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Detailed Setup
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Response Control
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Travel 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.
Travel Tuning Set
There are eleven Travel Tuning Sets
(TVL_TUNING_SET [42.10]) 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. Table 4-8 lists the
proportional gain, velocity gain and minor loop
feedback gain values for preselected tuning sets.
Note
Tuning set B is only available in
Pressure Control Mode.
In addition, you can specify Expert tuning and
individually set the proportional gain, velocity gain, and
minor loop feedback gain. Individually setting or
changing any tuning parameter will automatically
change the tuning set to X (expert).
Table 4-8. Gain Values for Preselected Travel Tuning Sets
Tuning
Set
Travel
Proportional
Gain
Travel
Velocity Gain
Travel Minor
Loop Feedback
Gain
C
D
E
F
G
4.4
4.8
5.5
6.2
7.2 3.0
3.0
3.0
3.1
3.6 35
35
35
35
34
H
I
J
K
L
M
8.4
9.7
11.3
13.1
15.5
18.0
4.2
4.8
5.6
6.0
6.0
6.0 31
27
23
18
12
12
X (Expert) User Adjusted User Adjusted User Adjusted
Note
Use Expert tuning if standard tuning
has not achieved the desired results.
Stabilize/Optimize may be used to
achieve the desired results more
rapidly than Expert tuning.
Table 3-2 provides tuning set selection guidelines for
Fisher and Baumann actuators. These tuning sets are
recommended starting points. After you finish setting
up and calibrating the instrument, you may have to
select either a higher or lower tuning set to get the
desired response.
For an actuator not listed in table 3-2, you can
estimate a starting tuning set by calculating the casing
or cylinder volume. Then, find an actuator in table 3-2
with the closest equivalent volume and use the tuning
set suggested for that actuator.
Travel Proportional Gain
Travel Proportional Gain (SERVO_GAIN [18]) is the
proportional gain for the travel control tuning set.
Changing this parameter will also change the tuning
set to Expert.
Travel Velocity Gain
Travel Velocity Gain (SERVO_RATE [20]) is the
velocity gain for the travel control tuning set. Changing
this parameter will also change the tuning set to
Expert.
Travel MLFB Gain
Travel MLFB Gain (TVL_MLFB_GAIN [44.5]) is the
minor loop feedback gain for the travel control tuning
set. Changing this parameter will also change the
tuning set to Expert.
4