Fisher FIELDVUE DVC6200 Instruction Manual page 74

DVC6200 Digital Valve Controller
Device Variables
The following menus are available to define and/or
view information about the instrument. From the
Online menu select Device Variables.
Note
Device Variables are not available for
instrument level AC.
Analog In (3-1)
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Analog Input shows the value of the instrument analog
input in mA (milliamperes) or % (percent) of ranged
input.
Travel Set Point (3-2)
Travel Set Point shows the requested valve position in
% of ranged travel.
Travel (3-3)
Travel shows the value of the DVC6200 digital valve
controller travel in % (percent) of ranged travel. Travel
always represents how far the valve is open.
Drive Signal (3-4)
Drive Signal shows the value of the instrument drive
signal in % (percent) of maximum drive.
Pressures (3-5)
Shows the value of the instrument supply and output
pressures in psi, bar, kPa, or kg/cm
output pressure differential. To display pressures may
require selecting the variable; a detail display of that
variable with its values will appear.
D Pressure A— Pressure A shows the value of
Output Pressure A in psi, bar, kPa, or kg/cm
D Pressure B— Pressure B shows the value of
Output Pressure A in psi, bar, kPa, or kg/cm
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D Pressure Diff—Pressure Differential shows the
value of the output pressure differential in psi, bar,
kPa, or kg/cm
D Supply Pressure—Supply Pressure displays the
instrument supply pressure in psi ,bar, kPa, or kg/cm
Not available in instrument level HC.
Variables (3-6)
The Variables menu is available to view additional
variables, including; Aux Input (Auxiliary Input),
Temperature, Temp Max (Maximum Temperature),
Temp Min (Minimum Temperature), Cycle Count, Tvl
Accum (Travel Accumulator), Raw Tvl Input (Raw
Travel Input), Run Time, and Num of Power Ups
(Number of Power Ups).
To view one of these variables, from the Online menu
select Device Variables and Variables. If a value for a
variable does not appear on the display, select the
variable and a detailed display of that variable with its
value will appear. A variable's value does not appear
on the menu if the value becomes too large to fit in the
allocated space on the display, or if the variable
requires special processing, such as Aux Input.
D Aux Input—The Auxiliary Input is a discrete input
that can be used with an independent limit or pressure
switch. Its value is either open or closed.
D Temperature—The internal temperature of the
instrument is displayed in either degrees Fahrenheit or
Celsius.
D Temp Max—Maximum Recorded Temperature
shows the maximum temperature the instrument has
experienced since installation.
D Temp Min—Minimum Recorded Temperature
shows the minimum temperature the instrument has
experienced since installation.
D Cycle Count—Cycle Counter displays the
number of times the valve travel has cycled. Only
changes in direction of the travel after the travel has
exceeded the deadband are counted as a cycle. Once
a new cycle has occurred, a new deadband around
the last travel is set. The value of the Cycle Counter
can be reset from the Cycle Count Alert menu. See
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. Also shows the
page 45 for additional information.
D Tvl Accum—Travel Accumulator contains the
total change in travel, in percent of ranged travel. The
accumulator only increments when travel exceeds the
deadband. Then the greatest amount of change in one
direction from the original reference point (after the
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deadband has been exceeded) will be added to the
Travel Accumulator. The value of the Travel
Accumulator can be reset from the Travel Accum
menu. See page 417 of the Detailed Setup section for
2
. additional information.
2
.
September 2010
2
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