Fisher FIELDVUE DVC6200 Instruction Manual page 32

Configuration
February 2017
PST Enable—Yes or No. This enables or disables the Partial Stroke Test.
PST Start Point—Valve Open or Valve Closed. This defines the travel stop that the valve needs to be at before a partial
stroke test can be initiated. This also defines the travel stop for end point pressure control. Setting this value to Not
Configured will disable partial stroke tests and end point pressure control.
PST Variables—Follow the prompts on the Field Communicator display to enter or view information for following PST
Variables:
D Max Travel Movement— This is the percentage of total span that the valve moves away from its normal operating
state towards its tripped state during the test. The default value is 10%.
D Test Speed—This is the rate at which the valve will move during the test. The default value is 0.25%/second.
D Pause Time—This is the pause time between the up and down strokes of the test. The default value is 5 seconds.
Figure 3‐4. Example Time Series Plots of Travel Set Point, Travel, Error, and Actuator Pressure
TEST START POINT
TEST SPEED
(%/SEC)
TRAVEL DEVIATION ALERT POINT
32
ACTUAL TRACE FROM TEST (TYPICAL)
TEST PAUSE
TIME (SEC)
ACTUAL TRACE FROM TEST (TYPICAL)
MAXIMUM DEVIATION
ACTUAL TRACE FROM TEST (TYPICAL)
MINIMUM PRESSURE
(Pmin)
TIME (SEC)
TIME (SEC)
PARTIAL STROKE PRESSURE LIMIT
TIME (SEC)
Instruction Manual
D103605X012
MAX. TRAVEL
PERCENT (%)