Flowserve 420 IOM - Manual (Page 35)

User Instructions - Logix® 420 Series Digital Positioners FCD LGENIM0106-06 12/13
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35
YYGY
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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.
YYYR
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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.
YYRG
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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.
YRGG
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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 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.
YRRY
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PIEZO VOLTAGE HIGH WARNING
PIEZO VOLTAGE LOW WARNING
Description: If the voltage to the piezo is to high, this could
indicate an error with the relay or the main board. This may
result from an extended period of inactivity, but in this case
should not persist for more than 30 minutes when the valve is
controlling. The positioner may still be functioning, but have
reduced performance under some circumstances. If 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.
RGGG
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COMMAND INPUT BELOW ADC RANGE
COMMAND INPUT ABOVE ADC RANGE
COMMAND INPUT RANGE TOO SMALL
Description: During Command Loop Calibration, the signal
was out of the Analog to Digital Converter (ADC) range, or
difference between the signal at 0% and the signal at 100%
was too small. The system is designed to accept a
difference greater than 5 mA and between 10 and 4085 ADC.
Possible Solutions: Recalibrate making sure to use valid
command signal values.
RGGY
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POSITION RANGE TOO SMALL
POSITION SENSOR ABOVE ADC RANGE
POSITION SENSOR BELOW ADC RANGE
Description: During calibration, the range of motion of the
position feedback arm was too small for optimum
performance or the feedback sensor moved beyond its range
of operation.
Possible Solutions: Check for loose linkages. Adjust the
positioner mounting. Adjust the feedback pin back into range.
Adjust the feedback pin to a position closer to the follower
arm pivot to create a larger angle of rotation and recalibrate.
The minimum angle of rotation should be greater than 15
degrees. Briefly pressing the QUICK-CAL/ACCEPT button
acknowledges a small range and the positioner will operate
using the short stroke calibration if otherwise a good
calibration.