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17. APPLICATION OF FUNCTIONS
17 - 58
4) Adjusting the lost motion compensation
When protrusions still occur, the compensation is insufficient. Increase the lost motion
compensation by approximately 0.5% until the protrusions are eliminated. When notches occur,
the compensation is excessive. Decrease the lost motion compensation by approximately 0.5%
until the notches are eliminated. Different values can be set as the compensation for each of
when the forward rotation (CCW) switches to the reverse rotation (CW) and when the reverse
rotation (CW) switches to the forward rotation (CCW).
The locus before compensation The locus after compensation
Compensation
Travel
direction
5) 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 timing with [Pr. PX41 Lost motion compensation timing]. Increase the
setting value of [Pr. PX41] from 0 by approximately 0.5 ms to adjust the compensation timing.
Before timing delay compensation After timing delay compensation
Compensation
Travel
direction
6) Adjusting the lost motion compensation non-sensitive band
When the lost motion is compensated twice around a quadrant change point, set [Pr. PX42 Lost
motion compensation non-sensitive band]. Increase the setting value so that the lost motion is not
compensated twice. Setting [Pr. PX42] may changes the compensation timing. Adjust the lost
motion compensation timing of (e).
Before timing delay compensation After timing delay compensation
Compensation
Travel
direction