IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
5-65
S-Curve Acceleration/Deceleration
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 from the output frequency to
the set accel/decel time. See S-Curve Characteristic timing diagrams below and on the following
page.
Table 5-51: S-Curve Acceleration/Deceleration Parameter Settings
The figure below shows FWD/REV run switching during deceleration to stop. The S-curve function
will add time to the acceleration and deceleration. Time to accelerate from the minimum frequency to
the maximum frequency (total acceleration) is:
Total Acceleration =
Time to decelerate from the maximum frequency to the minimum frequency (total deceleration) is:
Total Deceleration =
Figure 5-23: S-Curve Characteristic-FWD/REV Operation
Parameter Display Function Range Default
D09-01 SCrv Acc @ Start Sets the S-Curve at the beginning
of the Accel time.
0.00–10.00 sec 0.20*
D09-02 SCrv Acc @ End Sets the S-Curve at the end of the
Accel time.
0.00–10.00 sec 0.20*
D09-03 SCrv Dec @ Start Sets the S-Curve at the beginning
of the Decel time.
0.00–10.00 sec 0.20*
D09-04 SCrv Dec @ End Sets the S-Curve at the end of the
Decel time.
0.00–10.00 sec 0.20
* Initial value is determined by X-Press Programming (Table 4-6, 4-7, or 4-8 on pages 4-12, 4-13, and 4-14).
CAUTION
CAUTION Accel/Decel times will be extended.
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