37
Logix
®
420 Digital Positioner FCD LGENIM0106-07-AQ – 10/15
flowserve.com
RGRR
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
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
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 opera-
tion 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
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
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
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
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
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.
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