Fisher FIELDVUE DVC6200 Instruction Manual page 72

DVC6200 Digital Valve Controller
Instrument Time
Inst Time Invalid
Calibration and Diagnostics
Cal in Progress
Autocal in Progress
Diag in Progress
Diag Data Avail
Operational
Press Ctrl Active
Multi-Drop
Integrator
Integrator Sat Hi
Integrator Sat Lo
6
Device Record (2-3)
From the Online menu, select Device Diagnostics and
Device Record. Follow the prompts on the Field
Communicator display to view the following Device
Record parameters: Temp Max (Maximum
Temperature), Temp Min (Minimum Temperature),
Run Time, and Num of Power Ups (Number of Power
Ups).
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 Run Time—Indicates in hours or days the total
elapsed time the instrument has been powered up.
D Num of Power Ups—Number of Power Ups
indicates how many times the instrument has cycled
power.
Stroking the Digital Valve Controller
Output (2-4)
From the Online menu, select Device Diagnostics and
Stroke Valve. Follow the prompts on the Field
Communicator display to select from the following:
Done, Ramp Open, Ramp Closed, Ramp to Target,
Step to Target, and Stop.
D Done—Select this if you are done. All ramping is
stopped when DONE is selected.
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D Ramp Open—ramps the travel toward open at
the rate of 1.0% per second of the ranged travel.
D Ramp Closed—ramps the travel toward closed at
the rate of 1.0% per second of the ranged travel.
D Ramp to Target—ramps the travel to the
specified target at the rate of 1.0% per second of the
ranged travel.
D Step to Target—steps the travel to the specified
target.
Partial Stroke Test (ODV only) (2-5)
Note
Partial Stroke Test is only available for
instrument level ODV.
The Partial Stroke Test allows DVC6200 digital valve
controllers with instrument level ODV to perform a
Valve Signature type of test while the instrument is in
service and operational. In some applications, it is
important to be able to exercise and test the valve to
verify that it will operate when commanded. This
feature allows the user to partially stroke the valve
while continually monitoring the input signal. If a
demand arises, the test is aborted and the valve
moves to its commanded position. The partial stroke
valve travel is configurable between 1 and 30%
maximum travel, in 0.1% increments. Data from the
last partial stroke test is stored in the instrument
memory for retrieval by ValveLink software.
The Partial Stroke Test allows you to perform a partial,
10%, stroke test (standard) or a custom stroke test.
With the custom stroke test, the stroke may be
extended up to 30%. Be sure to check plant guidelines
before performing a custom stroke test. The purpose
of this test is to ensure that the valve assembly moves
upon demand.
A partial stroke test can be initiated when the valve is
operating at either 4 or 20 mA (point-to-point mode). In
applications where a spurious trip is to be minimized, 4
mA is the normal operating position.
When enabled, a partial stroke test may be initiated by
the device (as a scheduled, auto partial stroke test), a
remote push button located in the field or at the valve,
a Field Communicator, or ValveLink software.
Device (Digital Valve Controller)
The Auto Partial Stroke Test allows the partial stroke
test to be scheduled by the DVC6200. The test is
September 2010