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The output frequency increase or decrease in S type curve along with time. During the accelerating start and speed
reaching period, and decrease start and decreasing reaching period, set the speed as S curve. Thus the increasing and
decreasing action become smooth and the impact to load is decreased. The S curve Acc./Dec. is suitable for carry or
deliver the start and stop of load, like elevator, conveyor, etc. As showed in the following figure: t1 is accelerating time, t2
is decreasing time, ts is time of S curve initial segment, te is time of S curve end segment, F1.06=ts/t1, F1.07=te/t2.
Fig. F1-3 Straight Line and S Curve of Acc./Dec.
F1.06
Time ratio of initial segment in S curve
10.0
~
50.0
%
20.0%
F1.07
Time ratio of end segment in S curve
10.0
~
50.0
%
20.0%
Details described in S curve Acc./Dec. item of F1.05.
F1.08
Stop mode
0
~
1
0
0: accelerating stop
When receiving stop command, the VFD decreases output frequency gradually according to decelerating time until zero
and then stop. If stop DC brake function is valid, after reaching the stop DC brake initial frequency (according to F1.09 set,
it may takes a period of stop DC brake waiting time), the VFD will conduct DC brake process and then stop.
1: free stop