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4. Servo Adjustment
4 - 21
(3) Inductive voltage compensation
The current loop response is improved by compensating the back electromotive force element
induced by the motor rotation. 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.
Inductive voltage compensation
No. Abbrev. Parameter name Explanation Setting range
SV047 EC Inductive voltage
compensation gain
Set the inductive voltage compensation gain. Set to "100" as a standard.
If the current FB peak exceeds the current command peak, lower the gain.
0 to 200
(%)
POINT
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 load inertia is large.
0
0
3000
200
-200
-3000
Speed command
(r/min)
Current
command
(Rated current %)
No inductive voltage
compensation
With inductive
voltage
compensation
Time
Time