10.0
TROUBLESHOOTING
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MAGPOWR Spyder-Plus
MI 850A320 1 M
Page 39 of 60
10.3
Tuning Problems (Dancer Control)
Problem
Possible Cause
Solution or Diagnostic
Position unstable
Control is not optimally
tuned.
Use Quick Stabilize
Navigate to the
QuickStab
menu. Press
the
key and then press
If Unstable
to immediately try to stabilize.
Review “
Tuning
” once stability is obtained.
See Section 7.5.
“Cannot be stabilized.”
Appears while using quick
stabilize.
The dancer position
sensor is “phased”
incorrectly.
The dancer position sensor must be set up
per Section 7.4 and Figure 12.
The DFP or DFP-2 passes
through its “dead” zone.
The dancer position sensor must be set up
per Section 7.3 so that its voltage varies
smoothly from min to max as defined in
Figure 12. Verify that the dancer position
signal varies smoothly using the Position
screen in the Operator Loop.
The messages “Re-Tune P at
core” or “Re-Tune P at full”
repeatedly appear.
The system is less stable
at some intermediate roll
diameter than it is at core
or full roll.
When the message appears retune P at the
present diameter rather than at core or full
roll.
Dancer position does not
match the Setpoint
Low proportional gain
Optimize the proportional gain (P). This is
done at core for torque systems and at full
roll for speed systems.
For P and PD control there must always be
an error between the actual position and
the setpoint position to produce an output.
Adjust the position setpoint until the desired
dancer position is achieved.
Use PID (torque) or PI (speed). These can
be selected on the
Configure
menu
following selection of the
Control Type
.