Instruction Manual
Instruction Manual
D103557X012
Device Information, Diagnostics, and Alerts
January 2015
53
Diagnostics
Stroke Valve
Follow the prompts on the Field Communicator display to select from the following:
D Done—Select this if you are done. All ramping is stopped when DONE is selected.
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
WARNING
During the partial stroke test the valve will move. To avoid personal injury and property damage caused by the release of
pressure or process fluid, when used in an application where the valve is normally closed, provide some temporary means
of control for the process.
The Partial Stroke Test allows DVC6200 SIS digital valve controllers 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 in its normal (not tripped) state. For energizetotrip
(ETT) applications, the normal state is 4 mA. For deenergizetotrip (DETT) applications, the normal state is 20 mA
(pointtopoint mode) or 24 VDC (multidrop mode).
When enabled, a partial stroke test may be initiated by the device (as a scheduled, automatic partial stroke test), a
local pushbutton, the LCP100, a Field Communicator, or ValveLink software.
D Automatic (Scheduled)
The Auto Partial Stroke Test allows the partial stroke test to be scheduled by the DVC6200 SIS. The test is scheduled in
number of hours between tests. Any power cycle will reset the test clock timer.
D Local Pushbutton
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 10 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.