Logix
®
Digital Positioners FCD LGENIM0110-0 05/16
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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.
RRYG
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FEEDBACK LINKAGE ALARM
Description:
The feedback linkage is broken or the position
feedback POT is out of range.
Possible Solutions:
Fix broken linkage or adjust feedback
arm until full motion is within the range of the POT.
RRYY
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BACKLASH ALARM
Description: The amount of detected backlash has passed
the user set alarm limit. This may affect valve stability.
Possible Solutions: Check the stem and actuator for loose
components.
RRYR
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DRIVER MODULE ALARM
Description: The pilot relay can't open, the pilot relay can't
shut, or the Hall sensor circuit has failed.
Possible Solutions: Check the internal wiring connections.
Replace the pilot relay.
RRRY
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PIEZO VOLTAGE HIGH ALARM
Description: The voltage driving the piezo is above the
alarm limit. This could indicate an error with the relay or
the main board. The positioner may still be functioning, but
have reduced performance under some circumstances.
PIEZO VOLTAGE LOW ALARM
Description: The voltage to the piezo is too low. The piezo
may be damaged. This may prevent the proper failure
position upon loss of signal/power. This condition may
occur briefly on an air-to-close valve that is held for long
periods of time in the closed position, or an air-to-open
valve held in the open position.
Possible Solutions: Ensure the supply pressure is not low.
If alarm persists for more than 30 minutes, the Piezo
assembly is damaged. Replace the pilot relay.
RRRR
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POSITION DEVIATION ALARM
Description: The difference between the command and the
actual position has been greater than the user-set limit for
longer than a user-set time.
Possible Solutions: Review active alarms and warnings to
find root causes of this alarm. The deviation settings can
be changed in the Valve Health page of the DTM.
