YASKAWA G7 Series Technical Manual page 236

Entering S-curve Characteristics in the Acceleration and Deceleration Time
By performing acceleration and deceleration using an S-curve pattern, you can reduce shock when starting and
stopping the machine.
Using the Drive, you can set an S-curve characteristic time for each of the following: Acceleration start time,
deceleration start time, acceleration end time, and deceleration end time.
INFO
Setting Example
The S-curve characteristic when switching operation (forward/reverse) is shown in the following diagram.
Forward
Reverse
Output frequency
-18
6
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Acceleration/deceleration time gain (set value: 5)
Fig 6.19 Acceleration/Deceleration Time Gain Using an Analog Input
Set the S-curve characteristic time to lengthen acceleration/deceleration time as follows:
Acceleration time = Selected acceleration time + (Acceleration start time S-curve characteristic time +
Acceleration end time S-curve characteristic time) / 2
Deceleration time = Selected deceleration time + (Deceleration start time S-curve characteristic time +
Deceleration end time S-curve characteristic time) / 2
C2-02
C2-01
Fig 6.20 S-curve Characteristic during Operation Switching
(Acceleration/deceleration gain from 1 to
10 V) = 10 V/Input voltage (V) x 10 (%)
C2-04
C2-03
C2-01
C2-02
C2-04
C2-03