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With the PWM control of the inverter circuit, a dead time (non-energized time) is set to prevent 
short-circuits caused by simultaneous energizing of the P side and N side transistors having the 
same phase. The dead time has a non-sensitive band for particularly low voltage commands. Thus, 
when feeding with a low speed and a low torque, the control may be unstable. 
When an unbalance axis is lowering, the frictional torque and unbalance torque, and the frictional 
torque and deceleration torque before the quadrant changes during circle cutting, are balanced. 
The motor output torque will be approximately zero, and the control accuracy may drop. In this case, 
the control accuracy can be improved by using the voltage non-sensitive band compensation. Note 
that this may cause vibration to increase while the motor is running. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

No. Abbrev. Parameter 

name 

Explanation 

Setting  

range 

SV030 IVC 

Voltage 

non-sensitive 

compensation 

When 100% is set, the voltage equivalent to the logical non-energized time 
will be compensated. 
When "0" is set, a 100% compensation will be performed. 
Adjust in increments of 10% from the default value 100%. 

If increased too much, vibration or vibration noise may be generated.

 

0 to 200 

(%) 

 

Motor torque 

≒ 0 

Frictional torque 

Lowering

Balanced 

Unbalance torque 

Cutting direction

Deceleration torque = frictional torque