The following page structure is used in this manual.
7 Applied Functions
7 - 30
1S-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
7-9 Soft Start Function
This function sets the acceleration and deceleration against the velocity command input inside the
Servo Drive and uses these values for speed control.
With this function, soft starts are possible when the step rotation velocity commands are input. To
reduce any impacts made by acceleration changes, you can also use the velocity command filter
(first-order lag).
For a step velocity command input, set the time until the velocity command reaches 1,000 r/min in
Acceleration Time.
Similarly, set the time until the velocity command slows from 1,000 r/min down to 0 r/min in Decelera-
tion Time.
Acceleration Time (ms) = Vc/1,000 r/min × Acceleration Time × 0.1 ms
Deceleration Time (ms) = Vc/1,000 r/min × Deceleration Time × 0.1 ms
7-9-1 Objects Requiring Settings
Index
(hex)
Subindex
(hex)
Name Description
Refer-
ence
3021
–
Velocity Command Filter
–
P. 9 - 1 9
01 Acceleration Time Sets the acceleration time during accelera-
tion.
P. 9 - 1 9
02 Deceleration Time Sets the deceleration time during decelera-
tion.
P. 9 - 1 9
03 IIR Filter Enable Selects whether to enable or disable the
IIR filter in the velocity command filter.
0: Disabled
1: Enabled
P. 9 - 2 0
04 Filter Cutoff Frequency Sets the cutoff frequency for the IIR filter. P. 9-20
7-9-2 Soft Start Acceleration/Deceleration Time
Time
Velocity command [r/min]
Acceleration Time × 0.1 ms Deceleration Time × 0.1 ms
1,000 [r/min]
Velocity command before
acceleration control
(step type command)
Velocity command after
acceleration control
(trapezoidal type command)
Level 1
heading
Level 2
heading
Level 3
heading
Manual name
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