Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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17 APPLICATION OF FUNCTIONS
17.5 Machine diagnosis function
■
Execution of vibration failure prediction
When a threshold is inputted to the servo amplifier as indicated in the following section, the servo amplifier starts vibration
failure prediction. During vibration failure prediction, if the vibration level during servo motor operation, which is estimated by
the vibration estimation function, exceeds the threshold, [AL. F7.1 Vibration failure prediction warning] will occur. After the
occurrence of [AL. F7.1], if the vibration level during servo motor operation is lower than the threshold, [AL. F7.1] will be
canceled.

Page 559 Threshold setting method
■ Threshold reset method
To automatically reset a threshold after the threshold is set with the automatic threshold setting, set "Vibration failure
prediction warning selection (_ _ x _)" in [Pr. PF34] to "_ _ 3 _ (threshold reset)", and then cycle the power. After the power is
cycled, the threshold is reset and [Pr. PF34 (_ _ x _)] is set to "_ _ 1 _ (automatic threshold setting)". If parameters such as
gains and machine resonance suppression filters are changed, or any part of the equipment is replaced after the vibration
failure prediction function operates, reset the threshold.
Total travel distance failure prediction function
The total travel distance failure prediction function predicts a failure of the equipment from the servo motor total travel
distance. If the servo motor total travel distance exceeds the value of "Failure prediction - Servo motor total travel distance
multiplication selection (x _ _ _)" in [Pr. PF34]

[Pr. PF41 Failure prediction - Servo motor total travel distance], [AL. F7.3 Total
travel distance failure prediction warning] will occur.
The total travel distance failure prediction function can be used with the following procedure.
■
Total travel distance failure prediction warning setting
To enable the total travel distance failure prediction warning, "Servo motor total travel distance failure prediction warning
selection (_ x _ _)" in [Pr. PF34] to "_ 1 _ _ (enabled)".
■
Setting of servo motor total travel distance for failure prediction
Set a servo motor total travel distance for failure prediction. It is recommended that the servo motor total travel distance for
failure prediction be set to about the same as the rated life presented by each guide manufacturer and ball screw
manufacturer. For example, for a rated life of 8

10
5
rev, set "Failure prediction - Servo motor total travel distance
multiplication selection (x _ _ _)" in [Pr. PF34] to "2 _ _ _", and set [Pr. PF41] to "80". When "0" is set in [Pr. PF41], total travel
distance failure prediction does not start.
[Pr. PF46] × [Pr. PF40 (_ _ x _)]
Threshold = [Pr. PF45] + [Pr. PF46] × [Pr. PF40 (_ _ x _)]
[Pr. PF45]
Vibration level during
motor operation
ON
OFF
Torque
WNG
(warning)
0 0 0
[Pr. PF34]
Servo motor total travel distance failure prediction warning selection
0: Disabled
1: Enabled
2: Servo motor total travel distance reset