Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
72
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 an-
gle 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.
RGGR
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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
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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 sen-
sor. 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
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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
positioner 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.
RGYR
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ANALOG OUTPUT RANGE TOO SMALL
Description: During an Analog Output Calibration the difference
between the milliamp signal at 0% and the milliamp signal at 100%
was too small.
Possible Solutions: Recalibrate making sure to use a larger difference
between signal limits. This notification can be cleared by briefly press-
ing the QUICK-CAL/ACCEPT button.
RGRG
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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 per-
form a Pressure or Friction calibration if desired. See the Calibration
section of the IOM for warnings.
RGRY
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STROKE SHIFT
Description: The 0% and 100% valve positions have both shifted in
the same direction since the last stroke calibration. This may be relat-
ed 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 com-
pared 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.
