Integral Settings; Pressure Tuning - Fisher FIELDVUE DVC6200 Instruction Manual

Instruction Manual
D103409X012
D Performance Tuner
Note
The Performance Tuner is available for instrument level AD, PD, and ODV, and can only be run while in Travel control mode.
The Performance Tuner is used to determine digital valve controller tuning. It can be used with digital valve controllers
mounted on most sliding‐stem and rotary actuators, including Fisher and other manufacturers' products. Moreover,
because the performance tuner can detect internal instabilities before they become 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

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%.
D Integral 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

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 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 4‐5 lists the proportional gain, pressure
integrator gain and minor loop feedback gain values for preselected tuning sets.
Table 4‐5. Gain Values for Preselected Pressure Tuning Sets
Tuning Set Proportional Gain
B
C
D
E
F
G
H
I
J
K
L
M
X (Expert) User Adjusted
Integrator Gain
0.5 0.3
2.2 0.1
2.4 0.1
2.8 0.1
3.1 0.1
3.6 0.1
4.2 0.1
4.8 0.1
5.6 0.1
6.6 0.1
7.8 0.1
9.0 0.1
User Adjusted
Minor Loop Feedback Gain
35
35
35
35
35
34
31
27
23
18
12
12
User Adjusted
Detailed Setup
May 2013
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