Instruction Manual

Instruction Manual
D103557X012
Configuration
January 2015
24
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 or running the Performance Tuner or
Stabilize/Optimize routine 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 manual Expert tuning.
Table 3‐5 provides tuning set selection guidelines for Fisher and Baumann actuators. These tuning sets are only
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. You can use the Performance Tuner to optimize tuning.
D Proportional Gain—the proportional gain for the travel control tuning set. Changing this parameter will also change
the tuning set to Expert.
D Velocity Gain—the velocity gain for the travel control tuning set. Changing this parameter will also change the
tuning set to Expert.
D MLFB Gain—the minor loop feedback gain for the travel control tuning set. Changing this parameter will also change
the tuning set to Expert.
D Integral Enable—Yes or No. Enable the integral setting to improve static performance by correcting for error that
exists between the travel target and actual travel. Travel Integral Control is enabled by default.
D Integral Gain—Travel Integral Gain 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.
D Performance Tuner
WARNING
During performance tuning the valve may move, causing process fluid or pressure to be released. To avoid personal injury
and property damage caused by the release of process fluid or pressure, isolate the valve from the process and equalize
pressure on both sides of the valve or bleed off the process fluid.
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.