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69
Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
flowserve.com
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ACTUATOR CYCLES WARNING
ACTUATOR TRAVEL WARNING
BELLOWS CYCLES WARNING
BELLOWS TRAVEL WARNING
PILOT RELAY CYCLES WARNING
PILOT RELAY TRAVEL WARNING
VALVE CYCLES WARNING
VALVE TRAVEL WARNING
Description: The cycle or travel limit of the valve, actuator, bellows or
pilot relay has been exceeded. Each cycle represents two reversals of
the direction of valve movement. The cycle counting criterion and count
limit (for the valve, actuator and bellows) are set by the user to track the
usage of the valve assembly.
Possible Solutions: Follow routine procedures for maintenance when
the limit is reached. For example valve inspection may include checking
the packing tightness, and checking linkages for wear, misalignment,
and tightness. Bellows inspection may include checking bellows for
cracking or leaking. Actuator inspection may include checking the
actuator seals and lubrication. Relay inspection may include checking
for high air consumption and signs of wear on the spool. After mainte-
nance, reset the travel accumulator.
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POSITION AMPLITUDE WARNING
POSITION FREQUENCY WARNING
Description: The amplitude or frequency of the position signal is above
the warning limit. The positioner is controlling the position of the valve
with large or rapid corrections.
Possible Solutions: Verify the limits are set at an appropriate level. Ad-
just the selectable Gain switch to a lower setting or use the Hi Friction
setting. Perform a QUICK-CAL which sets the gains based on valve
response. Check for high friction. If the problem persists replace the
relay.
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COMMAND AMPLITUDE WARNING
COMMAND FREQUENCY WARNING
Description: The amplitude or frequency of the command signal is
above the warning limit. This could mean the control loop has larger
swings or is oscillating faster than desirable.
Possible Solutions: Verify the limits are set at an appropriate level. Re-
view the control loop parameters and equipment. Adjust as necessary.
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CONTINUOUS STROKE TEST FAILED WARNING
Description: During the continuous stroke test, the valve did not move
after 5 consecutive attempts. This could mean the valve has increased
friction, a change in process load or inadequate supply pressure.
Possible Solutions: Check friction, supply pressure and other alarms
or warnings that would indicate difficulty in moving the valve. Check
packing, and air supply. The warning will clear when the CST function
is turned off or when a successful attempt to move the valve occurs.
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PARTIAL STROKE TEST FAILED WARNING
Description: Measured times or forces during the last partial stroke test
did not pass the criteria set by the user. This may be an indication of
corrosion build-up on the valve stem or in the actuator, low or restricted
supply pressure, or a sticking positioner relay.
Possible Solutions: This warning will clear upon completion of a suc-
cessful partial stroke test.
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TEMPERATURE HIGH WARNING
TEMPERATURE LOW WARNING
Description: The temperature of the internal electronics has exceeded
the manufacturer set limits of -40°C (-40°F) to 85°C (176°F). Low tem-
perature may inhibit responsiveness and accuracy. 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. Heat the positioner if needed. If the
temperature reading is in error, replace the main board.
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VALVE CLOSED TOO FAR WARNING
VALVE OPENED TOO FAR WARNING
Description: While the valve was in use, it closed or opened farther than
it did at the last calibration by 0.5%.
Possible Solutions: Check the feedback arm linkage and ensure the
valve stem connection is tight. Recalibrate the stroke. If the process
cannot be interrupted a service technician may be able to adjust the
calibration.