Mitsubishi Electric MELSERVO-J5 MR-J5 Series User Manual page 216

Gear failure prediction function
The gear failure prediction function predicts the gear failure by comparing the backlash amount estimated by the backlash
estimation function with the backlash value set in the servo parameter.
After inputting the threshold to the servo amplifier with the gear diagnosis threshold setting method, performing backlash
estimation executes the gear failure prediction. Refer to the following for the gear diagnosis threshold setting method.
Page 210 Gear diagnosis threshold setting method
When executing the gear failure prediction, [AL. 0F7 Machine diagnostic warning] is outputted if the backlash estimate value
is larger than the threshold. When [AL. 0F7 Machine diagnostic warning] is outputted, this warning can be canceled by setting
[Pr. PF67 Backlash nominal value] to 0, resetting the communication, cycling the servo amplifier power, or executing software
reset.
[AL. 0F7 Machine diagnostic warning] is outputted after the backlash estimation is complete. [AL. 0F7 Machine diagnostic
warning] will not be outputted even if the backlash estimation result stored inside the servo amplifier is larger than the
backlash threshold.
Related objects [G] [WG]
Outline of objects related to the gear failure diagnosis function.
For details on the objects, refer to the User's Manual (Object Dictionary).
Index Sub
2C32h 0
4 APPLICABLE FUNCTIONS
214
4.5 Machine diagnosis
Object Name
VAR Backlash estimation value
Description
The result of backlash estimation is displayed.
When the gear numerator for backlash estimation or the gear
denominator for backlash estimation is set to "0", the backlash
estimation amount is outputted as the rotation angle on the servo motor
side.
When a value other than "0" is set for the gear ratio of backlash
estimation, a backlash estimated value is outputted in consideration of
the gear ratio for backlash estimation.
Unit: 0.01 [degree]