Mitsubishi Electric MELDAS MDS-B Series Instruction Manual page 135

(3) Inductive voltage compensation
The current loop response is improved by compensating the back electromotive force element
induced by the motor feedrate. This improved the current command efficiency, and allows the
acceleration/deceleration time constant to the shortened.
<Adjustment method>
1) While accelerating/decelerating at rapid traverse, adjust the inductive voltage compensation
gain (SV047:EC) so that the current FB peak is a few % smaller than the current command
peak.
Speed
command
(mm/min)
Current
command
(Rated current %)
No. Abbrev. Parameter name
SV047 EC Inductive voltage
compensation gain
POINT
Chapter 10 Adjustment
120
0
–120
No inductive voltage
compensation
200
0
With inductive
voltage
–200
compensation
Inductive voltage compensation
Unit
% Set 100% as a standard. Lower the gain if the current FB peak
exceeds the current command peak.
If the current FB peak becomes larger than the current command peak (over
compensation), an overcurrent (alarm 3A) will occur easily. Note that over
compensation will occur easily if the movable mass is large.
Explanation
10–24
Time
Time
Setting range
0 to 200