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11.3.22. Warning F8: Automatic Tuning Error
The command AT (Automatic tuning) automatically estimates the load moment of inertia.
The warning F8 occurs when the automatic tuning could not complete estimation of the load
moment of inertia.
◊ Indication on the terminal identifies the cause.
Table 11-31: Cause and remedy for the warning F8
Indication of terminal Cause Remedy
POSITION OVER?
The Motor rotated more than 30° during
automatic tuning.
• Remove external interference.
• Mount the Motor so that the Moro axis is
vertical. (Eliminate the effect of gravity.)
• Tune the servo gains referring to “5.3. Tuning
Level 2: servo Gain Tuning” instead of
automatic tuning.
OVER INERTIA
WRN.?
The load moment of inertia is too much.
• Remove the cause of excessive friction
resistance or mechanical interference that locks
the Motor.
• Reduce the load moment of inertia.
Refer to “Table 3-1:Maximum load inertia of
Megatorque Motor”
CAN’T TUNE? Cannot perform automatic tuning
• Remove the cause of external interference.
• Mount the Motor so that the Moro axis is
vertical. (Eliminate the effect of gravity.)
• Increase rigidity of the load.
• Tune the servo gains referring to “5.3. Tuning
Level 2: servo Gain Tuning” instead of
automatic tuning.
ALARM DETECTED? An alarm or a warning is occurring.
• Take measures against the cause of the alarm or
the warning.
CANCELED?
The input STP (Stop) is activated, or the
BS
key of the terminal is pressed.
• Confirm if the input STP is active or the BS
key is pressed.
(1) The input ACLR (Alarm clear) or the command CL (Clear alarm) clears the warning.
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