Flowserve Logix MD+ ValveSight - Manual (Page 51)

ValveSight™ Diagnostics DTM Manual for Logix MD+ Positioner with HART®
FCD- LGENSF0014-00
© Flowserve Corporation
51
below that limit.
Stroke Shift
•
Definition: The 0% and 100% valve positions have both shifted in the
same direction since the last stroke calibration. This may be related to
a bent or adjusted feedback linkage, loose positioner mounting, or an
over rotated feedback potentiometer.
•
Possible Solutions: Ensure the feedback linkage is not bent and the
positioner is mounted securely. If the feedback potentiometer is over-
rotated, repeat the stroke calibration until the Stroke Shift error is no
longer present. This notification can be cleared by briefly pressing the
QUICK-CAL/ACCEPT button.
Stroke Span Increase
•
Definition: The 0% and 100% valve positions are farther apart
compared to the last stroke calibration. This could indicate seat wear.
•
Possible Solutions: Inspect valve or schedule valve for
inspection. This notification can be cleared by briefly pressing the
QUICK-CAL/ACCEPT button
Stroke Span Decrease
•
Definition: The 0% and 100% valve positions are closer together
compared to the last stroke calibration. This could indicate debris or
build up at valve seat.
•
Possible Solutions: Inspect valve or schedule valve for
inspection. This notification can be cleared by briefly pressing the
QUICK-CAL/ACCEPT button.
Calibration Progress Status
Stroke Calibration in Progress
•
Definition: A stroke calibration sequence is in progress.
•
Possible Solutions: The calibration can be canceled from the Sensor
Calibration page of the DTM, from the handheld, or by briefly pressing
the Abort button.
Setting ILO
•
Definition: This is an automatic step in the calibration process that is
done with the valve at 50% position. This must be completed for proper
calibration.
•
Possible Solutions: The calibration can be canceled from the Sensor
Calibration page of the DTM, from the handheld, or by briefly pressing