Flowserve ValveSight Diagnostics - Manual (Page 44)

ValveSight Diagnostics for HART User Manual FCD VSENSF0001-02-AQ 03/15
44
The Accumulator Deadband is the distance which the valve must move before Accumulate Travel begins to increment. For
example, if the position of the valve is at 0% and the Accumulator Deadband is set to 5.0%, the valve will have to move to
5.0% before an Accumulated Travel will start to show movement. As the valve reaches 10%, an increment of 10% will be
shown in the Accumulated Travel box.
The Stroke Travel Length scales the Accumulated Travel. For example, if the Accumulated Travel shows 1000% and the
Stroke Travel Length is adjusted from 100 to 50, the Accumulated Travel will then show 500%.
Stroke Cycle Counter
Cycle Count is shown. For example, if the valve travels toward the open position, then toward the closed position, the
Cycle Count value will increase by 1.
The Cycle Alert Limit can be changed by typing in a new value.
The Cycle Dead Band is the distance which the valve must move before Cycle Count begins to increment. For example, if
the position of the valve is at 50% and the Cycle Dead Band is set to 5.0%, the valve will have to move to at least 55.0%
and back to 50% before the Cycle Count will show movement.
Data Management
Select Apply to save the selections to the positioner. Retrieve can be used to view values currently stored in the posi-
tioner.
11.2 Command Deviations
The Command Deviations screen allows you to set limits on the amount of deviation and how long the deviation lasts
before an alarm is triggered.
Command Deviation Alert
There are two settings to adjust the sensitivity of this alert. The first setting is the Tolerable Error +/- band for the valve
assembly. The second setting is the Deviation Time Frame. These settings will help to prevent the alarm from occurring
during normal changes in command. As the deviation value becomes greater than the Tolerable Error, a timer is started.
If the deviation remains larger than the Tolerable Error for longer than the time indicated by the Deviation Time Frame, the
Control Health bar on the Dashboard screen will turn red and an alarm will be sent in response to a HART command 48.
To adjust the limits, type in the desired value, or use the page up/down buttons on your keyboard. Press the
Apply button
at the bottom of the screen to activate the new limits in the positioner.