Instruction Manual
D103785X012
Configuration
June 2017
36
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
— 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
—The rate at which the valve will move during the test. The default value is 0.25%/second.
D
Pause Time
—The pause time between the up and down strokes of the test. The default value is 5 seconds.
Figure 3‐6. Example Time Series Plots of Travel Set Point, Travel, Error, and Actuator Pressure
ACTUAL TRACE FROM TEST (TYPICAL)
ACTUAL TRACE FROM TEST (TYPICAL)
ACTUAL TRACE FROM TEST (TYPICAL)
TEST START POINT
TEST SPEED
(%/SEC)
TEST PAUSE
TIME (SEC)
MAX. TRAVEL
PERCENT (%)
MAXIMUM DEVIATION
PARTIAL STROKE PRESSURE LIMIT
TRAVEL DEVIATION ALERT POINT
TIME (SEC)
TIME (SEC)
TIME (SEC)
MINIMUM PRESSURE
(Pmin)
TVL SET POINT, TRAVEL (%)
ERROR (%)
PRESSURE
(
%
)
