Справочник Пользователя для Mitsubishi Electronics MDS-R

 
 
 

 

 

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In LMC compensation, a model position considering the position loop gain is calculated based on 
the position command sent from the CNC, and compensation is carried out when the feed changes 
to that direction. When the CNC carries out feed forward (fwd) control, overshooting equivalent to 
the operation fraction unit occurs in the position commands, and the timing of the model position 
direction change may be mistaken. As a result, the LMC compensation timing may deviate, or 
compensation may be carried out twice or more.  

 

If feed forward control is carried out and the compensation does not operate correctly, Lost motion 
compensation non-sensitive band (SV040 (LMCT)) during feed forward control. In this 
non-sensitive band control, overshooting of the set width or less is ignored. The model position 
direction change point is correctly recognized, and the LMC compensation is correctly executed.  

 

This parameter is meaningless when feed forward control is not being carried out. 

 

 

If the compensation timing deviates during feed forward control, increase the LMCT setting by 1

m 

at a time.  

 

Note that 2

m are set even when the LMCT is set to 0. 

 

SV040 LMCT Lost 

motion 

compensation 
non-sensitive band 

Set the non-sensitive band of the lost motion compensation in the feed 
forward control. 
When "0" is set, the actual value that is set is 2

m. Adjust by increasing 

by 1

m at a time. 

0 to 100 

(µm)