ABB PositionMaster EDP300 Operating Instruction page 70

70 PositionMaster EDP300 DIGITAL POSITIONER | OI/EDP300-EN REV. D
... 9 Operation
... Parameter descriptions
Menu: Partial Stroke
Menu / parameter Value range
Diagnosis / Partial Stroke
PS Configuration PS Vent Amount,
Timeout Value
Dead Time
PS Interval 0 to 1000 days
PS Start Now Test Passed
Test Failed
Description
• PS Vent Amount: Position change in the direction of the safety position (venting of positioner
output 1) by which the valve is to be moved.
• Timeout Value: If the valve does not reach the new valve position, which has changed by the amount
defined by 'PS Vent Amount', within the defined time (Timeout Time), an alarm is issued.
The step response from the DTM can be used to determine the partial stroke parameters.
Note
The default setting for this time is automatically determined by Auto Adjust (only in Auto Adjust mode:
Valve Ranges, Full).
• Dead Time: Use this parameter (dead time) to set the time in which the valve should have moved out
of the end position.
The dead time must be less than half the 'Timeout Value'.
Note
The partial stroke must be tested after configuration!
Use this parameter to define the time interval according to which the 'Partial Stroke Test' is triggered
on a cyclical basis.
Use this parameter to trigger the partial stroke directly.
The result is shown on the display:
• Test Passed – Test successful
• Test Failed – Test failed
NOTICE
Property damage
During the test, the valve no longer follows the set point current. This change in the valve position
may have a detrimental effect on the process.