Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
70
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SUPPLY PRESSURE HIGH WARNING
Description: The supply pressure is above the user set warning limit.
Supply pressure that exceeds the maximum rating on the actuator can
become a potential hazard.
Possible Solutions: Regulate the supply pressure at the positioner
below the maximum limit recommended for your actuator. Recalibrate
pressure sensors. Check the pressure sensor board connections.
Replace pressure sensor board if necessary.
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SUPPLY PRESSURE LOW WARNING
Description: The supply pressure is below the user set warning limit.
Low supply pressure can cause poor valve response or positioner fail-
ure. The minimum recommended supply pressure for proper operation
is 1.3 bar (19 PSI).
Possible Solutions: Regulate the supply pressure at the positioner
above 1.3 bar (19 PSI). Ensure system air/gas supply is adequate.
Repair kinked or restricted supply tubing. Check for pneumatic leaks in
the actuator and actuator tubing. Recalibrate pressure sensors. Check
the pressure sensor board connections and replace pressure sensor
board if necessary.
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ACTUATION RATIO WARNING
Description: The force required to control the system is close to the
maximum available force. Actuation Ratio is based on the ratio of
available force to the required force to fully actuate. Control may be lost
if this ratio reaches 100%. It is affected by the process load, friction,
spring force, and available supply pressure.
Possible Solutions: Increase the supply pressure. Reduce the friction.
Check the actuator spring. Resize the actuator. Adjust user set limits.
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MEMORY ERROR WARNING
Description: 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.
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SOFTWARE ERROR WARNING
Description: There has been a watch dog time out, stack overflow
warning, or CPU usage warning.
Possible Solutions: If the problem persists, perform a factory reset. If it
still persists, reprogram or replace the main board.
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AIR SUPPLY HUMID WARNING
Description: The supply gas has high relative humidity which can lead
to condensation on electronic components and failure of electronic
functions.
Possible Solutions: Ensure supply gas is clean and dry. Check and clean
the regulator filter.
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AIR SUPPLY ICING WARNING AIR SUPPLY ICING WARNING
Description: The supply gas has high relative humidity and the tempera-
ture is close to 0 °C (32 °F). Under these conditions ice may form in the
pilot relay causing diminished or total loss of position control.
Possible Solutions: Ensure supply gas is clean and dry. Check and clean
the regulator filter.
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PILOT RELAY RESPONSE WARNING
Description: The pilot relay is sticking or slow to respond. 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 Re-
lay Response limits. Check supply pressure. Check the spool or poppet
for debris, oil, corrosion, ice on the spool. Clean or replace the spool
or poppet assembly. Replace the piezo or driver module assembly.
Maintain a clean, water-free air/gas supply.
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FRICTION LOW WARNING
Description: The friction has passed below the user set limit. Low fric-
tion is an indication of improperly loaded packing and, in severe cases,
can be an indication of the process fluid leaking at the valve stem.
Possible Solutions: Check for packing leak. Tighten or replace the valve
packing.
