Flowserve 420 IOM - Manual (Page 37)

User Instructions - Logix® 420 Series Digital Positioners FCD LGENIM0106-06 12/13
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37
RGRR
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FACTORY RESET STATE
Description: The positioner is in factory reset state.
Calibration is required to enable control.
Possible Solutions: Perform a Stroke Calibration (QUICK-
CAL).
RYGG
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VALVE CAN'T OPEN ALARM
VALVE CAN'T SHUT ALARM
Description: Pressure has been applied (or removed) to open
or shut the valve, but the valve is not moving. This may be
caused by excessive friction.
Possible Solutions: Verify adequate supply pressure is
applied. Verify the feedback linkage is connected. View the
friction trends if available. Consider the following: Clear any
external or internal mechanical obstruction, loosen the
packing, clean the stem, repair or replace the actuator, repair
the valve if galling is suspected.
RYYG
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SUPPLY PRESSURE LOW ALARM
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.
RYRG
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POSITION SENSOR FAILURE ALARM
Description: The feedback arm may be disconnected from
the valve assembly or the sensor has failed.
Possible Solutions: Check the feedback arm linkage.
Recalibrate. If the problem persists return the unit for repair.
RYRR
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MAIN BOARD ELECTRONIC FAILURE WARNING
Description: There has been an oscillator fault, position
sensor ADC failure, supply voltage error, reference voltage
error, shunt voltage error, or piezo voltage error.
Possible Solutions: This may be caused by transient
conditions. If the error persists, replace the main board.
RRGG
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PILOT RELAY RESPONSE ALARM
Description: The pilot relay is sticking or extremely slow to
respond. This affects the responsiveness, increases the
chance of limit cycling and excessive air consumption. The
pilot relay consists of the driver module assembly with piezo
(I-P relay) which is coupled to the spool valve or poppet.
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 the supply
pressure. Check the spool or poppet for debris, oil,
corrosion, ice on the spool. Clean or replace the spool
assembly. Replace the piezo or driver module assembly.
Maintain a clean, water-free air/gas supply.
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.
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.