Mitsubishi Electric MELSERVO-J5 User Manual page 252
Ac servo system
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Also See for MELSERVO-J5:
- User manual (478 pages) ,
- Sample screen manual (128 pages) ,
- Introduction manual (112 pages)
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■Setting "Failure prediction - Servo motor total travel distance"
Set the "Failure prediction - Servo motor total travel distance" when using the automatic threshold setting. It is recommended
that the servo motor total travel distance for failure prediction be set to about the same as the rated life suggested by the
manufacturers of the guides and ball screws being used. For example, for a rated life of 8 × 10
prediction - Servo motor total travel distance] to "80000" [10 rev].
■Threshold setting method
When the automatic threshold setting is used, [Pr. PF42 Friction failure prediction - Average characteristic] and [Pr. PF43
Friction failure prediction - Standard deviation] for determining the threshold value are automatically rewritten according to the
dynamic friction (at rated speed) estimated inside the servo amplifier. At this time, the threshold can be changed with [Pr.
PF40.0 Friction failure prediction - Threshold multiplication]. If [AL. 0F7.2 Friction failure prediction warning] is generated with
the value calculated by the automatic threshold setting, set [Pr. PF40.0 Friction failure prediction - Threshold multiplication] to
"6" or more. After the threshold is calculated in the servo amplifier, [Pr. PF34.0 Friction failure prediction warning selection]
changes to "2" (manual threshold setting).
For the manual threshold setting, the upper and lower limit thresholds can be calculated with the equations below. When [Pr.
PF40.0 Friction failure prediction - Threshold multiplication] is "0", the upper and lower limit thresholds are calculated as "5".
Upper limit threshold [0.1 %] = [Pr. PF42] + [Pr. PF43] × [Pr. PF40.0]
Lower limit threshold [0.1 %] = [Pr. PF42] - [Pr. PF43] × [Pr. PF40.0]
■Threshold reset method
To automatically reset thresholds after the upper and lower limit thresholds are set automatically, set [Pr. PF34.0 Friction
failure prediction warning selection] to "3" (threshold reset), then cycle the power. After cycling the power, the threshold value
is reset, and [Pr. PF34.0 Friction failure prediction warning selection] changes to "1" (threshold value automatic setting). If the
equipment parts are replaced after starting the friction failure prediction function, reset the friction thresholds and servo motor
total travel distance.
4 APPLICABLE FUNCTIONS
250
4.5 Machine diagnosis
5
rev, set [Pr. PF41 Failure
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