Fisher FIELDVUE DVC6200 Instruction Manual page 91

Instruction Manual
D103409X012
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)
Field Communicator Service Tools > Partial Stroke Test (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 scheduled in
number of hours between tests. Any power cycle will reset the test clock timer.
Auxiliary Terminal
The auxiliary terminal can be used for different applications. The default configuration is for a partial stroke test
initiated by shorting the contacts wired to the auxiliary +/- terminals of the DVC6200. Refer to Auxiliary Terminal
Wiring Length Guidelines below.
D Local Push Button
A partial stroke test command may be sent to the digital valve controller using a set of contacts wired to the auxiliary
+/- terminals. To perform a test, the contacts must be closed for 3 to 5 seconds and then opened. To abort the test,
close the contacts for 1 second. The last set of diagnostic data is stored in the instrument memory for later retrieval via
ValveLink software.
D Local DI
When configured by the user interface, the Auxiliary Terminal can be used as a discrete input from a pressure switch,
temperature switch etc., to provide an alert.
Viewing Device Variables and Diagnostics
May 2013
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