Servo Adjustment
6.1.1 Using the Soft Start Function
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6.1 Smooth Operation
This section provides technical information on the smooth operation of Servomotors.
6.1.1 Using the Soft Start Function
The soft start function adjusts progressive speed reference input inside the Servopack so that ac-
celeration and deceleration can be as constant as possible. To use this function, set the following
user constants.
Pn305
Soft Start Acceleration
Time
Unit:
ms
Setting
Range:
0 to 10000
Factory
Setting:
0
Speed Control
Pn306
Soft Start Deceleration
Time
Unit:
ms
Setting
Range:
0 to 10000
Factory
Setting:
0
Speed Control
In the Servopack, a speed reference is multiplied by the acceleration or deceleration value set
in Pn305 or Pn306 to provide speed control.
The soft start function enables smooth speed control when inputting progressive speed refer-
encesor when selecting internally-set speeds. Set both Pn305 and Pn306 to “0” for normal speed
control.
Set these user constants as follows:
D
Pn305: The time interval from the time the motor starts until the motor maximum speed is
reached.
D
Pn306: The time interval from the time the motor isoperating at the motor maximum speed
until it stops.
Speed reference
Soft start
Maximum speed of Servomotor
Servopack internal
speed reference
Pn305: Set this time interval.
Pn306: Set this time interval.
Maximum speed of Servomotor
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