Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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17 APPLICATION OF FUNCTIONS
17.5 Machine diagnosis function
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Execution of friction failure prediction
When upper and lower limit thresholds are inputted to the servo amplifier as indicated in the following section, the servo
amplifier starts friction failure prediction. During friction failure prediction, if the dynamic friction (at rated speed) estimated by
the friction estimation function exceeds the upper or lower limit threshold, [AL. F7.2 Friction failure prediction warning] will
occur. After the occurrence of [AL. F7.2], if the dynamic friction (at rated speed) falls within the upper/lower limit threshold,
[AL. F7.2] will be canceled.
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Page 557 Threshold setting method
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Threshold reset method
To automatically reset thresholds after the upper and lower limit thresholds are set automatically, set "Friction failure
prediction warning selection (_ _ _ x)" in [Pr. PF34] to "_ _ _ 3 (threshold reset)", and then cycle the power. After the power is
cycled, the thresholds are reset and [Pr. PF34 (_ _ _ x)] is set to "_ _ _ 1 (automatic threshold setting)". If any part of the
equipment is replaced after the friction failure prediction function operates, reset the friction thresholds and servo motor total
travel distance.
[Pr. PF43] × [Pr. PF40 (_ _ _ x)]
Threshold = [Pr. PF42] + [Pr. PF43] × [Pr. PF40 (_ _ _ x)]
[Pr. PF42]
Time
Dynamic friction
(at rated speed)
WNG
(warning)
Torque
ON
OFF