Mitsubishi Electric MELSERVO-J5 User Manual page 260
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 method [A]
The vibration prediction function predicts a failure of the equipment with the increase of the vibration level, which is estimated
by the vibration estimation function. If a failure of the equipment is predicted from the vibration, [AL. 0F7.1 Vibration failure
prediction warning] occurs. Use the following flowchart to set the vibration failure prediction function.
Set [Pr. PF51.1 Vibration failure prediction warning selection] 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.
Set a threshold with the following servo parameters.
[Pr. PF56 Vibration failure prediction - Average characteristics]
[Pr. PF57 Vibration failure prediction - Standard deviation]
[Pr. PF52.1 Vibration failure prediction - Threshold multiplication]
*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 The data of the estimated vibration level and vibration frequency can be saved on the machine diagnosis screen of MR Configurator2.
For the vibration failure prediction function, the threshold that triggers [AL. 0F7.1 Friction failure prediction warning] can be set
using the following two methods.
■Automatic threshold setting
From the vibration level estimated by the vibration estimation function, a threshold that triggers [AL. 0F7.1 Vibration failure
prediction warning] is automatically calculated in the servo amplifier. With this setting, the vibration failure prediction function
can be used without setting a threshold. However, after the vibration failure prediction function operates, the equipment must
be operated for about 90 hours before vibration failure prediction is actually performed. [AL. 0F7.1] does not occur until the
calculation of the threshold value in the servo amplifier is complete.
4 APPLICABLE FUNCTIONS
258
4.5 Machine diagnosis
Startup the system.
Threshold setting method?
Manual threshold setting
* 2
Vibration failure prediction is performed.
If the vibration level during servo motor operation exceeds the threshold,
[AL. 07F.1 Vibration failure prediction warning] will occur.
Start
Automatic threshold setting
Set [Pr. PF51.1 Vibration failure prediction warning selection] to "1"
(Automatic threshold setting).
Drive the servo motor.
The vibration level and vibration frequency are estimated.
Save the estimated vibration level and vibration frequency.
The threshold is automatically calculated.
The settings of [Pr. PF56 Vibration failure prediction - Average characteristics]
and [Pr. PF57 Vibration failure prediction - Standard deviation] are changed
based on the estimated vibration level.
Has a threshold been created?
[Pr. PF51.1 Vibration failure prediction warning selection] is set to "2"
(Manual threshold setting).
End
* 2
* 1
NO
YES
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