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MDS-D-SVJ3/SPJ3 Series Instruction Manual
4-4 Characteristics improvement
<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>
While accelerating/decelerating at rapid traverse, adjust the inductive voltage compensation gain
(SV047: EC) so that the current FB peak (MAX current 3) is a few % smaller than the current
command peak (MAX current 2).
【#2247】 SV047 EC Inductive voltage compensation gain
Set the inductive voltage compensation gain. Standard setting value is "100".
If the current FB peak exceeds the current command peak, lower the gain.
---Setting range---
0 to 200 (%)
If the current FB peak (MAX current 3) becomes larger than the current command peak (MAX current
2) (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
Tim
e
Inductive voltage compensation
POINT