Flowserve Logix MD+ ValveSight - Manual (Page 79)

ValveSight™ Diagnostics DTM Manual for Logix MD+ Positioner with HART®
FCD- LGENSF0014-00
© Flowserve Corporation
79
NOTE: Flowserve does not recommend any action, only lists possible actions that could
restore the system to normal operation. Qualified maintenance personnel should evaluate
the possible solutions, all safety procedures and all other applicable factors on a case by
case basis when determining the best action to take.
Legend
The legend shows the purpose of the icons.
Action Buttons
The Apply button will save changes to the connected device.
The Retrieve button will retrieve the latest information from the device.
Warnings and Alarms
Pilot Response
•
Definition: The pilot relay is sticking or slow to respond.
•
Implications: This affects the responsiveness, increases the chance of
limit cycling and excessive air consumption. The pilot relay is part of the
inner loop and consists of the driver module assembly with piezo (I-P
relay) which is coupled to the spool valve or poppet. The value of this
indicator corresponds with inner loop lag. Delayed response can be
caused by a partially clogged piezo or debris, oil, corrosion, or ice on
the spool, or low supply pressure.
•
Possible Solutions: Check response of the valve. If OK, adjust Pilot