Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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17 APPLICATION OF FUNCTIONS
17.5 Machine diagnosis function
*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.
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.)
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]
based on the rated life.
*1
Which function do you use?
Has the threshold been created?
End
How do you set the threshold?
Has the servo motor total travel
distance exceeded 1/2 of
"[Pr. PF34 (x _ _ _)] × [Pr. PF41]"?
Has the servo motor total travel
distance exceeded 1/2 of
"[Pr. PF34 (x _ _ _)] × [Pr. PF41]"?
Manual threshold setting Automatic threshold setting
YES
NO
YES
NO
YES
NO
Friction estimation function
Drive the servo motor.
Save the estimated static friction and dynamic friction.
Drive the servo motor. Drive the servo motor.
The static friction and dynamic friction (at rated speed) are
estimated. The static friction and dynamic friction (at rated speed) are
estimated.
Save the estimated static friction and dynamic friction. *2
[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.
Save the estimated static friction and dynamic friction. *2
[Pr. PF40 Machine failure prediction parameter] is changed.
The threshold is automatically calculated.
*4
[Pr. PF34 (_ _ _ x)] is set to "_ _ _ 2".
[Pr. PF40 Machine failure prediction parameter] is changed.
Use the following parameters to set the threshold. *3
[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]
Set "Friction failure prediction warning selection (_ _ _ x)" in
[Pr. PF34] to "_ _ _ 2 (manual threshold setting)". Set "Friction failure prediction warning selection (_ _ _ x)" in
[Pr. PF34] to "_ _ _ 1 (automatic threshold setting)".
The static friction and dynamic friction (at rated speed) are
estimated.
[Pr. PF42 Friction failure prediction - Average characteristic]
and [Pr. PF43 Friction failure prediction - Standard deviation]
are changed based on the estimated dynamic friction.
Friction failure prediction is performed.
When the dynamic friction becomes out of the threshold
range, [AL. F7.2 Friction failure prediction warning] will occur.
Friction failure prediction function