Mitsubishi Electric MELSERVO J5 Series User Manual page 103

Adjusting the lost motion compensation timing
When the machine has low rigidity, the speed loop gain is set lower than the standard setting value, or the servo motor is
rotating at high speed, quadrant projections may occur behind the quadrant change points. In this case, you can suppress the
quadrant projections by delaying the lost motion compensation with [Pr. PE49 Lost motion compensation timing]. To adjust the
compensation timing, increase the setting value of [Pr. PE49] by approximately 0.5 ms, starting from 0 ms (initial value).
Travel direction
Delayed timing before compensation
Adjusting the lost motion compensation non-sensitive band
Set [Pr. PE50 Lost motion compensation non-sensitive band] when the lost motion compensation is executed twice around a
quadrant change point. Increase the setting value to stop the lost motion compensation from being executed twice. Setting
[Pr. PE50] may change the compensation timing. Adjust the lost motion compensation timing again.
Page 101 Adjusting the lost motion compensation timing
Compensation
Travel direction
Non-sensitive band and delayed
timing before compensation
Compensation
Delayed timing after compensation
Non-sensitive band and delayed
timing after compensation
11 PATH CONTROL FUNCTION
11.2 Lost motion compensation function
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