Fisher FIELDVUEDVC6200f Instruction Manual page 52

DVC6200f Digital Valve Controller
Detailed Setup - Transducer Block
February 2017
Note
Travel / Pressure Select must be set to Travel for double acting actuators.
Travel / Pressure Select 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.
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.
Pressure Range Hi (PRESS_RANGE_HI [67.7]) 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.
Pressure Range Lo (PRESS_RANGE_LO [67.8]) 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.
Travel Deviation/Pressure Fallback
D Deviation Fallback Enabled (DEV_FALLBK_ENABLE [66.1]) enables the fallback behavior.
D Deviation Fallback Threshold (DEV_FALLBK_THRESHOLD [66.2]) If the travel deviation exceeds this threshold for
more than the defined Fallback Time then the instrument falls back to pressure control.
D Deviation Fallback Time (DEV_FALLBK_TIME [66.2]) defines the amount of time the travel deviation must exceed
the Fallback Threshold before the instrument falls back to pressure control.
D Deviation Fallback Minimum Supply Pressure (DEV_FALLBK_MIN_SUPPLY [66.4]) defines the minimum supply
pressure required for the instrument to fall back to pressure control.
Cutoff
D Travel Cutoff Hi (FINAL_VALUE_CUTOFF_HI [16]) 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 (FINAL_VALUE_CUTOFF_LO [17]) 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 Hi (PRESS_CUTOFF_HI [74.1]) 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 Lo (PRESS_CUTOFF_LO [74.2]) 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%
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Instruction Manual
D103412X012