Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 555

Vibration estimation function/vibration failure prediction function
Use the vibration estimation function or the vibration failure prediction function with the following procedure. In the vibration
failure prediction function, a threshold that outputs a warning can be automatically calculated in the servo amplifier with
"Automatic threshold setting", or set by using parameters with "Manual threshold setting". With the manual threshold setting,
you can set any threshold that outputs a warning.
Start the system. (Refer to chapter 4.)
Manual threshold setting
Set "Vibration failure prediction warning selection (_ _ x _)" in
[Pr. PF34] to "_ _ 2 _ (manual threshold setting)".
Drive the servo motor.
The vibration level and vibration frequency are estimated.
Save the estimated vibration level and vibration frequency.
Use the following parameters to set the threshold.
[Pr. PF45 Vibration failure prediction - Average characteristic]
[Pr. PF46 Vibration failure prediction - Standard deviation]
"Vibration failure prediction - Threshold multiplication
(_ _ x _)" in [Pr. PF40 Machine failure prediction parameter]
Vibration failure prediction is performed.
When the vibration level at servo motor operation exceeds the
threshold, [AL. F7.1 Vibration failure prediction warning] will occur.
*1 If the equipment is operated continuously for less than 3 hours, and operated in the position mode or velocity mode for a cumulative time
of less than 90 hours, a threshold is not calculated automatically.
*2 You can save the data of the estimated static friction and dynamic friction on the machine diagnosis screen of MR Configurator2.
Start
Which function do you use?
Vibration failure prediction function
How do you set the threshold?
Automatic threshold setting
Set "Vibration failure prediction warning selection (_ _ x _)" in
[Pr. PF34] to "_ _ 1 _ (automatic threshold setting)".
Drive the servo motor.
The vibration level and vibration frequency are estimated.
*2 Save the estimated vibration level and vibration frequency.
The threshold is automatically calculated.
[Pr. PF45 Vibration failure prediction - Average characteristic] and
[Pr. PF46 Vibration failure prediction - Standard deviation] are
changed based on the estimated vibration level.
Has the threshold been created?
[Pr. PF34 (_ _ x _)] is set to "_ _ 2 _".
End
Vibration estimation function
Drive the servo motor.
The vibration level and vibration frequency are estimated.
Save the estimated vibration level and vibration frequency.
*2
*1
NO
YES
17 APPLICATION OF FUNCTIONS
17.5 Machine diagnosis function
17
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