Sigma II User’s Manual
Chapter 6: Servo Adjustment
6-2
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 servo
amplifier so that acceleration and deceleration can be as constant as possible. To use
this function, set the following parameters.
In the servo amplifier, a speed reference is multiplied by the acceleration or deceler-
ation value set in Pn305 or Pn306 to provide speed control.
The soft start function enables smooth speed control when progressive speed refer-
ences are input or when contact input speed control is used. 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 maximum
speed is reached.
•
Pn306:
The time interval from the time the motor is operating at the maximum
speed until it stops.
Parameter
Signal
Setting
(ms)
Description
Pn305
Soft Start Acceleration Time
Setting Range: 0 to 10000
Default Setting: 0
Speed Control
Pn306
Soft Start Deceleration Time
Setting Range: 0 to 10000
Default Setting: 0
Speed Control
Speed reference
Soft start
Maximum speed
Servo amplifier internal
speed reference
Pn305: Set this time interval.
Pn306: Set this time interval.
Maximum speed
