Soft Start; Speed Reference Filter - YASKAWA Sigma-V Series User Manual

5 Operation

5.3.3 Soft Start

5.3.3

Soft Start

The soft start is a function to convert stepped speed reference input into constant acceleration and decelera-
tion. The time can be set for acceleration and deceleration.
Speed reference
Motor speed
Use this function to smooth speed control (including selection of internal set speeds).
Note: Set both parameters Pn305 and Pn306 to "0" (factory setting) for normal speed control.
Pn305
Pn306
Pn305: The time interval from the time the servomotor starts until the motor maximum speed is reached.
Pn306: The time interval from the time the servomotor is operating at the motor maximum speed until it stops.
Actual accel/decel time can be calculated with the following equation.
Actual accel time =
Actual decel time =
5.3.4

Speed Reference Filter

This smooths the speed reference by applying a first order lag filter to the analog speed reference (V-REF)
input.
Note: The user need not usually change the setting. A setting value that is too large, however, will slow down response.
Check the response characteristics when setting this parameter.
Pn307
5-26
Soft Start Acceleration Time
Setting Range Setting Unit
0 to 10000
Soft Start Deceleration Time
Setting Range Setting Unit
0 to 10000
Target speed
×
Max. speed
Target speed
×
Max. speed
Max. speed
Target speed
Actual
accel time
Pn305
Speed Reference Filter Time Constant
Setting Range Setting Unit
0 to 65535
Analog
Factory Setting
1 ms 0
Factory Setting
1 ms 0
Soft start time (accel time Pn305)
Soft start time (decel time Pn306)
Actual
decel time
Pn306
Factory Setting
0.01 ms 40
Speed
When Enabled
Immediately
Speed
When Enabled
Immediately
Analog
Torque
Speed Position
When Enabled
Immediately
Classification
Setup
Classification
Setup
Classification
Setup