Flowserve Logix MD+ ValveSight - Manual (Page 248)

ValveSight™ Diagnostics DTM Manual for Logix MD+ Positioner with HART®
FCD- LGENSF0014-00
© Flowserve Corporation
248
Stroke Characterization
The Stroke Characterization page enables you to change the relationship between the
command input and the valve position. This relationship is shown by the characterization
curve. The characterization curve changes the Input Command (4-20) into a corresponding
Final Command. The actual valve position corresponds to the Final Command as shown on
the Dashboard.
The curves may be selected on the Characterization page or by using the DIP switches on
the positioner. To change the characterization curve on this screen, select the Override DIP
Switches button, and then choose the desired curve from the Characterization Selection
dropdown box. Press Apply and the changes will take effect immediately. The Retrieve
button will display the curve presently used by the positioner.
To customize the custom curve, select the Customize link. This can be done before or after
the Custom curve is applied.
When changing the characterization curve, consider disabling the local interface with the
tamper lock feature on the
Local Interface screen. Otherwise the changes you make will be
discarded when another Quick-Cal is performed. The Quick-Cal always uses settings
shown on the DIP switches on the positioner.