TROUBLESHOOTING
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CYGNUS
MI 850A316 1 B
Page 39 of 66
9.1
Out of round roll comp OFF
Message: “Out of Round Roll Compensation has been turned off.”
Out of Round Roll Compensation is immediately turned off with the first keystroke of Quick Stabilize. (This does not
include minimization of Error Limit.) Continue with Paragraph 9.2.
9.2
Out of round roll comp ACTIVE
Navigate to:
Home>>More..>>Program>>Calibrate>>Calibrate Dynamics>>Out of round comp.
Alt
ernately switch between “Yes” and “No” for Out of Round Enable
If oscillation do not
improve when switching to “No”:
Press
>>Optimize Manually>>Quick Stabilize
And follow the instructions.
If oscillations do improve:
If the instability first occurred at the present RPM set Out of Round Max RPM less than the present
RPM as read on Actual RPM.
If the instability first occurred at a lower RPM set Out of Round Max RPM to a value less than that
RPM.
(Out of Round Compensation will be disabled f
or all RPM’s greater than Out of Round Max RPM. It may be
possible to increase this Max RPM somewhat by reducing Out of Round Gain. Only experimentation can tell.
Out of Round Gain is only active while Out of Round Comp is enabled and RPM is less than Out Of Round Max
RPM.)
9.3
Auto-tune diagnostics
"
Oscillations should start within 10 sec…."
"
….if oscillations do not stop within 15 cycles."
Both of these problems can occur if there is an oscillation in the tension while in Manual Mode that is too large
compared to the disturbance induced by Auto-Tune. This can often be corrected by either of the following:
1) Decrease the magnitude of the oscillation that is present while in manual mode. Note that, since we are in
Manual Mode during Auto-Tune, we are talking about an oscillation that is being caused by the user's process,
not by the Cygnus. Such oscillations could be caused by out of round rolls, failed bearings, etc. The
magnitude of such oscillations can often be reduced by running at slower speed while Auto-Tuning.
2) Increase the Disturbance Level Percentage used by Auto-Tune. This level can be edited on the Auto-Tune
menu. (
Home>>More..>>Calibrate>>Calibrate Dynamics>>Auto Tune Menu
). When Auto-Tune is started,
the output will switch around the Manual Percentage by this amount in order to introduce an intentional
disturbance in the tension. The user should be careful not to increase the Disturbance Level so much that
damage will occur. Note that the Disturbance Level Percentage is a percentage of the Manual Level. (e.g. if
Manual Level = 30%, and the Disturbance Level = 10% then the output will switch between 27% and 33%.
If neither of these is successful, Optimize Manually may be used.
Summary of Contents for Cygnus MAGPOWR
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