Fisher FIELDVUE DVC6200f Instruction Manual page 69

Instruction Manual
D103412X012
Note
Travel / Pressure Select must be set to Travel for double acting actuators.
Travel / Pressure Select (TVL_PRESS_SELECT [41.1]) determines if the instrument is setup 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.
D Travel Deviation Pressure Fallback—Travel Deviation Pressure Fallback occurs when the instrument detects that the
travel sensor is outside of its normal range of operation or that a gross deviation exists between set point and actual
travel. It switches to Pressure Control and no longer uses the travel sensor to position the valve.
D Travel Cutoff Hi—Travel Cutoff Hi (FINAL_VALUE_CUTOFF_HI [15]) defines the high cutoff point for the travel in
percent (%) of pre‐characterized setpoint. Above this cutoff, the travel target is set to 123.0% of the ranged travel.
Travel Cutoff Hi is deactivated by setting it to 125.0%.
D Travel Cutoff Lo—Travel Cutoff Lo (FINAL_VALUE_CUTOFF_LO [16]) defines the low cutoff point for the travel in
percent (%) of pre‐characterized setpoint. Below this cutoff, the travel target is set to -23%. A Travel Cutoff Lo of
0.5% is recommended to help ensure maximum shutoff seat loading. Travel Cutoff Lo is deactivated by setting it to
-25.0%
D Pressure Cutoff Open—Pressure Cutoff Open (PRESS_CUTOFF_HI [47.1]) 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 Open of 99.5% is recommended to ensure valve goes fully open. Pressure Cutoff Hi is deactivated by
setting it 125%.
D Pressure Cutoff Closed—Pressure Cutoff Closed (PRESS_CUTOFF_LO [47.2]) defines the low cutoff point for the
pressure in percent (%) of pre‐characterized setpoint. Below this cutoff, the pressure target is set to -23%. A Pressure
Cutoff Closed of 0.5% is recommended to help ensure maximum shutoff seat loading. Pressure Cutoff Closed is
deactivated by setting it to -25.0%
D Pressure Range Hi—Pressure Range Hi (PRESS_RANGE_HI [42.7]) is the high end of output pressure range. Enter the
pressure that corresponds with 100% valve travel when Zero Power Condition is closed, or 0% valve travel when
Zero Power Condition is open. This pressure must be greater than the Pressure Range Lo.
D Pressure Range Lo—Pressure Range Lo (PRESS_RANGE_LO [42.8]) is the low end of the output pressure range. Enter
the pressure that corresponds to 0% valve travel when Zero Power Condition is closed, or 100% valve travel when
Zero Power Condition is open. The pressure must be less than the Pressure Range Hi.
Input Characterization
TB > Configure/Setup > Detailed Setup > Response Control > Input Characterization
Field Communicator
Input Characterization (INPUT_CHAR [50]) defines the relationship between the travel target and the setpoint
received from the output block. Travel target is the output from the characterization function.
Detailed Setup—Transducer Block
July 2013
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