Yaskawa Large Capacity Sigma II Series - Manual (Page 185)

5 Servo Adjustment
5.1.1 Using the Soft Start Function
5-2
5.1 Smooth Operation
This section provides technical information on the smooth operation of servomotors.
5.1.1 Using the Soft Start Function
The soft start function adjusts progressive speed reference input inside the SERVOPACK so
that acceleration and deceleration can be as constant as possible.
To use this function, set the following parameters.
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-
ences or when selecting internally-set speeds. Set both Pn305 and Pn306 to 0 for normal
speed control.
Set these parameters as follows:
• Pn305: The time interval from the time the motor starts until the motor maximum speed
is reached.
• Pn306: The time interval from the time the motor is operating at the motor maximum
speed until it stops.
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
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