Справочник Пользователя для Mitsubishi Electronics MDS-R

 
 
 

 

 

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If the load torque differs in the positive and negative directions such as with a vertical axis or slant 
axis, the torque offset (SV032 (TOF)) is set to carry out accurate lost motion compensation. 

 

 

Measure the unbalance torque. Carry out reciprocation operation (approx. F1000) with the axis to 
be compensated and measure the load current % when fed at a constant speed on the NC servo 
monitor screen. The unbalance torque at this time is expressed with the following expression. 

   Unbalance torque (%) = 

    (+ feed load current %)    +    (- feed load current %)   

                                              2 

 

 

 

The unbalance torque value above is set for the torque offset (TOF). 

 

If there is a difference in the protrusion amount according to the direction, make an adjustment with 
LMC2. Do not adjust with TOF. 

 

 

Assume that the load current % was -40% in the + direction and -20% in the - direction 
when JOG feed was carried out at approx. F1000. The unbalance torque is as shown 
below, so -30% is set for TOF.  

 

 

 

   -40 + (-20)

          2 

= -30%

 

 

 
 
 

SV032 

TOF 

Torque offset 

Set this to carry out lost motion compensation. 
Set the unbalance torque for the vertical axis and slant axis. 

-100 to 100 

(Stall current %)

 
 

 

 

Even when TOF is set, the torque output characteristics of the motor and load 
current display of the NC servo monitor will not change. Only the characteristics 
of the LMC compensation function are affected.