Travel/Pressure Control - Fisher FIELDVUE DVC6200 Instruction Manual

Detailed Setup
May 2013
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).
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 Expert tuning.
D Integral Enable—Yes or No. Enable the pressure integral setting to improve static performance by correcting for
error that exists between the pressure target and actual pressure. Pressure Integral Control is disabled by default.
D Integral Gain—Pressure Integral Gain (also called reset) is the gain factor applied to the time integral of the error
signal between desired and actual pressure. Changing this parameter will also change the tuning set to Expert.

Travel/Pressure Control

Field Communicator Configure > Detailed Setup > Response Control > Travel/Pressure Control (1‐2‐2‐2)
D Travel/Pressure Select
Travel/Pressure Select determines if the instrument is set up for position or pressure control. Select Travel, Pressure,
Travel with Pressure Fallback/Auto recovery or Travel with Pressure Fallback/Manual Recovery. If the travel sensor fails,
and Travel with Pressure Fallback/Auto Recovery is selected, it will return to travel control when the travel sensor starts
working again. Travel with Pressure Fallback/Manual recovery will stay in pressure control until Travel Pressure Select is
changed to Travel or Travel with Pressure Fallback/Auto recovery. It is not necessary to enable the Travel Sensor Alert
for Pressure Fallback to occur.
Note
Travel / Pressure Select must be set to Travel for double‐acting actuators
Cutoffs and Limits
D Cutoff Hi
Travel Cutoff High defines the high cutoff point for the travel in percent (%) of ranged input current. Above this
cutoff, the travel target is set to 123.0% of the ranged input current. When a Travel Cutoff High is set, the Travel
Limit High is deactivated, since only one of these parameters can be active. Travel Cutoff Hi is deactivated by setting
it to 125.0%.
Pressure Cutoff Hi defines the high cutoff point for the pressure in percent (%) of pre‐characterized setpoint. Above
this cutoff, the pressure target is set to 123.0%. A Pressure Cutoff Hi of 99.5% is recommended to ensure valve goes
fully open. Pressure Cutoff Hi is deactivated by setting it to 125%.
D Cutoff Lo
Travel Cutoff Low defines the low cutoff point for the travel set point. Travel Cutoff Low can be used to ensure
proper seat load is applied to the valve. When below the travel cutoff low, the output is set to zero or to full supply
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Instruction Manual
D103409X012