Mitsubishi Electric MELSERVO-J5 User Manual page 253

Setting method [A]
The friction failure prediction function predicts a failure of the equipment from the increase and decrease in the dynamic
friction (at rated speed) estimated by the friction estimation function. If a failure of the equipment is predicted, [AL. 0F7.2
Friction failure prediction warning] will occur. Set the friction failure prediction function in accordance with the following course:
Set [Pr. PF51.0 Friction failure prediction warning selection] to "2"
(Manual threshold setting).
Drive the servo motor.
The static friction and dynamic friction (at rated speed) are estimated.
Save the data of the estimated static friction and dynamic friction.
Set a threshold with the following servo parameters.
[Pr. PF49 Friction failure prediction - Compensation coefficient 1]
[Pr. PF50 Friction failure prediction - Compensation coefficient 2]
[Pr. PF54 Friction failure prediction - Average characteristics]
[Pr. PF55 Friction failure prediction - Standard deviation]
[Pr. PF52.0 Friction failure prediction - Threshold multiplication]
The setting of [Pr. PF52 Machine failure prediction servo parameter] is changed.
Has the servo motor total travel distance
exceeded half the value of [Pr. PF53 Failure prediction -
Servo motor total travel distance]?
Start
Startup the system.
[Pr. PF31] setting
(When the maximum operation speed is under the rated speed, set half the
value of the maximum operation speed.)
Based on the rated life, set [Pr. PF53 Failure prediction - Servo motor total
travel distance].
Threshold setting method?
Manual threshold setting
*1
*2
NO
YES
Friction failure prediction is performed.
If the dynamic friction value exceeds the threshold range, [AL. 0F7.2
Friction failure prediction warning] will occur.
Automatic threshold setting
Set [Pr. PF51.0 Friction failure prediction warning selection] to "1"
(Automatic threshold setting).
Drive the servo motor.
The static friction and dynamic friction (at rated speed) are estimated.
Save the data of the estimated static friction and dynamic friction.
The setting of [Pr. PF52 Machine failure prediction servo parameter] is changed.
The settings of [Pr. PF49 Friction failure prediction - Compensation coefficient 1]
and [Pr. PF50 Friction failure prediction - Compensation coefficient 2] are
changed based on the data of the estimated dynamic friction.
Has the servo motor total travel distance
exceeded half the value of [Pr. PF53 Failure prediction -
Servo motor total travel distance]?
YES
The threshold is automatically calculated.
The settings of [Pr. PF54 Friction failure prediction - Average characteristics] and
[Pr. PF55 Friction failure prediction - Standard deviation] are changed based on
the data of the estimated dynamic friction.
Has a threshold been created?
[Pr. PF51.0 Friction failure prediction warning selection] is set to "2"
(Manual threshold setting).
End
*1
NO
*3
NO
YES
4 APPLICABLE FUNCTIONS
4.5 Machine diagnosis
4
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