YASKAWA VS-616PS5 Series Programming Manual page 34

Section C: Tuning Parameters
C7 S-Curve Accel/Decel
C7 S-Curve Accel/Decel
An S-curve pattern is used to reduce shock and provide smooth transitions during machine
acceleration and deceleration. S-curve characteristic time is the time it takes to reach the set
accel/decel rate during a speed change.
C7-01 S-Curve Time at Acceleration Start
C7-02 S-Curve Time at Acceleration End
C7-03 S-Curve Time at Deceleration Start
C7-04 S-Curve Time at Deceleration End
Setting Range:
Factory Default:
.
Frequency Reference
Output Frequency
The following figure shows FWD/REV run switching with deceleration to stop.
FWD Run Command
REV Run Command
Output Frequency
Time to accelerate from the minimum frequency
to the maximum frequency (total acceleration)
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0.00 to 2.50s
0.00s
S-curve Characteristic
Time (Tsc)
Figure 15 S-curve Characteristic Timing Diagram
C7-02 C7-03
C7-01
Figure 16 S-curve Characteristics - FWD/REV Operation
Output Frequency
C7-04
C7-01
C7-02
= C1-XX + (C7-01 + C7-02)/2
Time
DC Injection Braking
Time at Stop
B2-04
C7-04
C7-03
VS-616PS5 Programming Manual
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