Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 554

Set "Friction failure prediction warning selection (_ _ _ x)" in
[Pr. PF34] to "_ _ _ 2 (manual threshold setting)".
Drive the servo motor.
The static friction and dynamic friction (at rated speed) are
estimated.
Save the estimated static friction and dynamic friction.
Use the following parameters to set the threshold.
[Pr. PF19 Friction failure prediction - Compensation coefficient 1]
[Pr. PF20 Friction failure prediction - Compensation coefficient 2]
[Pr. PF42 Friction failure prediction - Average characteristic]
[Pr. PF43 Friction failure prediction - Standard deviation]
"Friction failure prediction - Threshold multiplication (_ _ _ x)" in
[Pr. PF40 Machine failure prediction parameter]
[Pr. PF40 Machine failure prediction parameter] is changed.
Has the servo motor total travel
distance exceeded 1/2 of
"[Pr. PF34 (x _ _ _)] × [Pr. PF41]"?
*1 When the servo amplifier is replaced after the equipment is operated, set [Pr. PF41] and [Pr. PF34 (_ _ _ x)] based on the value obtained
by subtracting the present motor total travel distance from the rated life.
*2 You can save the data of the estimated static friction and dynamic friction on the machine diagnosis screen of MR Configurator2.
*3 Even if [Pr. PF19] and [Pr. PF20] are unchanged from the initial value, the function operates properly. However, setting the value
estimated by the automatic threshold setting will decrease the possibility of an erroneous detection for failure prediction.
*4 If the equipment is operated continuously for less than 3 hours, or the friction estimation is not completed for the travel direction set in
[Pr. PF40], the threshold is not calculated automatically.
17 APPLICATION OF FUNCTIONS
552
17.5 Machine diagnosis function
Start
Start the system. (Refer to chapter 4.)
[Pr. PF31] setting
(When your operation pattern is under rated speed, set 1/2 of the
maximum speed.)
Which function do you use?
Set [Pr. PF41 Failure prediction - Servo motor total travel distance] and
"Failure prediction - Servo motor total travel distance multiplication
selection (x _ _ _)" in [Pr. PF34 Machine diagnosis function selection]
*1
based on the rated life.
How do you set the threshold?
Manual threshold setting
*2
*3
NO
YES
Friction failure prediction is performed.
When the dynamic friction becomes out of the threshold
range, [AL. F7.2 Friction failure prediction warning] will occur.
End
Friction estimation function
Friction failure prediction function
Automatic threshold setting
Set "Friction failure prediction warning selection (_ _ _ x)" in
[Pr. PF34] to "_ _ _ 1 (automatic threshold setting)".
Drive the servo motor.
The static friction and dynamic friction (at rated speed) are
estimated.
Save the estimated static friction and dynamic friction.
[Pr. PF40 Machine failure prediction parameter] is changed.
[Pr. PF19 Friction failure prediction - Compensation coefficient 1]
and [Pr. PF20 Friction failure prediction - Compensation coefficient
2] are changed based on the estimated dynamic friction.
Has the servo motor total travel
distance exceeded 1/2 of
"[Pr. PF34 (x _ _ _)] × [Pr. PF41]"?
YES
The threshold is automatically calculated.
[Pr. PF42 Friction failure prediction - Average characteristic]
and [Pr. PF43 Friction failure prediction - Standard deviation]
are changed based on the estimated dynamic friction.
Has the threshold been created?
YES
[Pr. PF34 (_ _ _ x)] is set to "_ _ _ 2".
Drive the servo motor.
The static friction and dynamic friction (at rated speed) are
estimated.
Save the estimated static friction and dynamic friction.
*2
NO
*4
NO