Flowserve ValveSight Diagnostics - Manual (Page 50)

ValveSight Diagnostics for HART User Manual FCD VSENSF0001-02-AQ 03/15
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Equal Percent Characterization Curve
Custom Characterization Curve
Characterization Configuration
The curves may be selected on the Characterization screen or by using the DIP switches on the positioner. To change the
characterization curve on this screen, select the
Override DIP Switches button, then choose the desired curve from the
Characterization Selection drop-down box. Press Apply and the changes will take affect immediately. The Retrieve button will
display the curve presently used by the positioner. To customize the custom curve, select the Custom button. This can be
done before or after the Custom curve is applied.
WARNING: Overriding the DIP switches on the Logix positioner may cause the valve to stroke suddenly. Continue only if you
are certain the changes will not cause harm to personnel or processes.
When the Software DIP Switch Status shows “Enabled” the characterization curve selected won the DIP switches (Linear,
Equal Percent, or Custom) will be reinstated when a stroke calibration is performed.
When changing the characterization curve, consider changing the Software DIP Switch Status to “Disabled”. This way the
changes you make will not be discarded if another stroke calibration (QUICK-CAL) is performed. To change the status to
“Disabled” use the Configuration>Basic/Local Interface screen. Turn the Local Interface switch to Off. This disables the but-
tons on the positioner.
Custom Characterization Curve
The Custom Characterization curve can be modified by the user. To do this, change the values in the Output Signal % column
by using the up/down buttons or page up/down buttons on the keyboard. You can move the location of the points on the
graph with your mouse if you first click on the
Select button (white arrowhead) at the top of the graph. After the Output
Signal values have been changed, select Apply.
WARNING: Applying new custom characterization values while the positioner is set to CUSTOM will cause closure member
movement.