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6-23
6-8 Soft Start
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
6
Applied Functions
6-8 Soft Start
This function is used to control the rotation speed. It sets the acceleration and deceleration
against the rotation speed command in the Servo Drive.
The function can be used for step rotation speed commands, and allows soft starts. The S-
curve Acceleration and Deceleration function is used to reduce any impacts by acceleration
changes.
Parameters Requiring Settings
Soft Start Acceleration or Deceleration Time
Set the time required for a step speed command to reach the maximum motor rotation speed
into the Soft Start Acceleration Time (Pn312). In the same manner, set the time required for
the command to decrease the speed from the maximum motor rotation speed to 0 r/min into
the Soft Start Deceleration Time (Pn313).
The time taken for acceleration or deceleration is calculated by the following formula, where
Vc [r/min] is the target rotation speed of the speed command.
Precautions for Correct Use
Do not set the Soft Start Acceleration Time and the Soft Start Deceleration Time when the position
loop structure with a Host Controller is used.
Parameter
number
Parameter name
Explanation
Reference
Pn312
Soft Start Acceleration
Time
Sets the acceleration time for the rotation speed
command input.
Pn313
Soft Start Deceleration
Time
ets the deceleration time for the rotation speed
command input.
Pn314
S-curve Acceleration/
Deceleration Time
Setting
Sets the acceleration or deceleration processing
S-curve time for the rotation speed command input.
Acceleration Time [ms] = Vc / Maximum motor rotation speed
×
Pn312
×
1 ms
Deceleration Time [ms] = Vc / Maximum motor rotation speed
×
Pn313
×
1 ms
Rotation speed [r/min]
Maximum motor
rotation speed Step input of a rotation
speed
command
Rotation speed
command after
acceleration or
deceleration
processing
Pn312
×
1ms
Pn313
×
1ms
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