Fisher FIELDVUE DVC6200 Instruction Manual page 26

Configuration
February 2017
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.
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.
D Stabilize/Optimize
WARNING
During Stabilize/Optimize 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.
Stabilize/Optimize permits you to adjust valve response by changing the digital valve controller tuning. During this
routine the instrument must be out of service, however, the instrument will respond to setpoint changes.
If the valve is unstable, select Decrease Response to stabilize valve operation. This selects the next lower tuning set
(e.g., F to E). If the valve response is sluggish, select Increase Response to make the valve more responsive. This selects
the next higher tuning set (e.g., F to G).
If after selecting Decrease Response or Increase Response the valve travel overshoot is excessive, select Decrease
Damping to select a damping value that allows more overshoot. Select Increase Damping to select a damping value that
will decrease the overshoot. When finished, select done.
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Instruction Manual
D103605X012