Logix
®
420 Digital Positioner FCD LGENIM0106-07-AQ – 10/15
36
RGGR
INNER LOOP OFFSET TIME OUT
Description: During calibration the Inner Loop Offset (ILO) value did not
settle. This could result in less accurate positioning.
Possible Solutions: Repeat the stroke calibration to get a more accurate
ILO value. To proceed using the less accurate ILO value, this error may
be cleared by briefly pushing the QUICK-CAL/ACCEPT button. Lowering
the setting on the gain selection switch may help if the actuator is
unstable during the calibration.
RGYG
SETTLE TIME OUT
Description: During calibration, the position feedback sensor showed
movement, but did not settle.
Possible Solutions: Check for loose linkages or a loose positioner
sensor. This error may appear on some very small actuators during the
initial calibration. Recalibrating may clear the problem, or this error may
be cleared by briefly pushing the QUICK-CAL/ACCEPT button.
RGYY
NO MOTION TIME OUT
Description: During a stroke calibration, there was no valve motion
detected. Because some valves are quite large, this indicator can take
up to 9 minutes to detect an error.
Possible Solutions: Check linkages and air supply to make sure the
system is properly connected. If the time out occurred because the
actuator is very large then simply retry the QUICK-CAL and the posi-
tioner will automatically adjust for a larger actuator by doubling the time
allowed for movement. This error may be cleared by briefly pushing the
QUICK-CAL/ACCEPT.
RGRG
STROKE CALIBRATION REQUIRED
Description: A factory reset was performed and the positioner has
not yet been calibrated. The unit will not respond to commands and
will remain in the failsafe position until a calibration is successfully
completed.
Possible Solutions: Perform a Stroke Calibration (QUICK-CAL) by
holding the QUICK-CAL/ACCEPT button down for 3 seconds, or perform
a Pressure or Friction calibration if desired. See the CALIBRATION
section of the IOM for warnings.
RGRY
STROKE SHIFT
Description: The 0% and 100% valve positions have both shifted in the
same direction since the last stroke calibration. This may be related to
a bent or adjusted feedback linkage, loose positioner mounting, or an
over rotated feedback potentiometer.
STROKE SPAN DECREASE
Description: The 0% and 100% valve positions are closer together
compared to the last stroke calibration. This could indicate debris or
build up at valve seat.
STROKE SPAN INCREASE
Description: The 0% and 100% valve positions are farther apart
compared to the last stroke calibration. This could indicate seat wear.
Possible Solutions: Ensure the feedback linkage is not bent and the
positioner is mounted securely. If the feedback potentiometer is
over-rotated, repeat the stroke calibration until the Stroke Shift error is
no longer present. Inspect valve or schedule valve for inspection. This
notification can be cleared by briefly pressing the QUICK-CAL/ACCEPT
button.
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