Flowserve Logix MD+ ValveSight - Manual (Page 39)

ValveSight™ Diagnostics DTM Manual for Logix MD+ Positioner with HART®
FCD- LGENSF0014-00
© Flowserve Corporation
39
•
Definition: The microprocessor's memory has a problem.
•
Possible Solutions: Error may clear with time. If error persists, cycle
power and complete a QUICK-CAL. If the error still persists, perform a
factory reset, reprogram or replace the main circuit board.
Temperature High
•
Definition: The temperature of the internal electronics has exceeded
the manufacturer set limit of 85°C (176°F). High temperature may affect
performance or limit the life of the positioner.
•
Possible Solutions: Regulate the temperature of the positioner by
shading or cooling supply gas. If the temperature reading is in error,
replace the main board.
Temperature Low
•
Definition: The temperature of the internal electronics has exceeded
the manufacture set limit of -40°C (-40°F). Low temperature may inhibit
responsiveness and accuracy.
•
Possible Solutions: Regulate the temperature of the positioner. If the
temperature reading is in error, replace the main circuit board.
Friction Status
Friction High
•
Definition: The valve and actuator friction has passed the user set
limit.
•
Implications: High friction can cause loop oscillations, poor position
control, jerky motion, or valve sticking. It can be caused by build-up
from the process on the stem, trim or seat , by a failing bearing or
guides in the valve and actuator, galling of the trim or stem, excessively
tightened packing, linkages, or other valve or actuator mechanical
issues.
•
Possible Solutions: Determine if the friction is significantly interfering
with the valve control. If not, consider increasing the friction warning
limit. Consider the following to reduce friction: Stroke the valve to clear
off build-up. Clear any external mechanical obstruction, loosen the
packing, clean the stem, repair or replace the actuator. Highly localized
friction or very jerky travel can indicate internal galling. Repair or
replace internal valve components.
Friction Low
•
Definition: The friction has passed below the user set limit.
•
Implications: Low friction is an indication of improperly loaded packing
and, in severe cases, can be an indication of the process fluid leaking at