Shihlin electric SDP Series, Manual

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6.3.3. Smooth Speed command
If the motor input command changes abruptly, it might cause motor vibrate and noise, or
may even cause overshoot. Shihlin servo provides three smooth operation parameters to
suppress the negative influence caused by sudden change of the input command. First of
all, the speed acceleration time constant can adjust the slope of the change in acceleration,
the speed deceleration time constant can adjust the slope of the change in deceleration, and
the S-curve acceleration and deceleration time constant can improve the motor stability
when starts and stops.
Name
Parameter
abbreviation
Parameter
code
Setting
range
Unit
Default
value
Control
mode
Acceleration time
constant
STA PC01 0~20000 ms 200 S, T
Deceleration time
constant
STB PC02 0~20000 ms 200 S, T
S-curve acc.
/dec. time
constant
STC PC03 0~10000 ms 0 Pr, S, T
The description of the 3 parameters are as follows:
Speed acceleration time constant:
This parameter is the acceleration time when the motor speed changes from 0 rpm to the
rated motor speed, which is set as the acceleration time constant. For example, the rated
speed of the servo motor is 3000 rpm, and this parameter is set to 3000 (3s). so the time for
the motor to accelerate from 0 rpm to 3000 rpm is 3 seconds. When the speed command is
set to 1000 rpm, it takes 1 second for the motor to change from 0 rpm to 1000 rpm.
Speed deceleration time constant:
When the motor speed is decelerated from the rated speed to 0 rpm, the required deceleration
time is the deceleration time constant. For example, the servo motor runs at 3000 rpm, this
parameter is set to 3000(3s), then the time for the motor to decelerate from 3000 rpm to 0rpm
is 3 seconds. When the motor is running at 1000 rpm, it takes 1 second to decelerate from
1000 rpm to 0 rpm.