User Instructions - Logix® 520MD+ Series Digital Positioner
FCD LGENIM0105-00
© Flowserve Corporation
45
Field Trial Version – Printed October 28, 2011
Possible Solutions: This warning will clear upon completion
of a successful partial stroke test.
YYGG
●●
●●
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 temperature may inhibit responsi veness
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.
YYGY
●●
●
●
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.
YYGR
●●
●
●
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.
YYYG
●●●
●
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 failure. 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.
YYYY
●●●●
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 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.
YYYR
●●●
●
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.
YYRG
●●
●
●
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.
YYRY
●●
●
●
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.
YYRR
●●
●●
AIR SUPPLY ICING WARNING AIR SUPPLY ICING
WARNING
Description: The supply gas has high relative humidity and
the temperature is close to 0 °C (32 °F). Under th ese
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.
YRGG
●
●
●●
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 Relay 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.
YRGY
●
●
●
●
FRICTION LOW WARNING
Description: The friction has passed below the user set limit.
Low friction is an indication of improperly loaded packing
Содержание Logix 520MD+
Страница 53: ......
