Soft Start; Speed Reference Filter - YASKAWA JUSP-MD D01A Series User Manual

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.
Soft Start Acceleration Time
Pn305
Setting Range
0 to 10000
Soft Start Deceleration Time
Pn306
Setting Range
0 to 10000
Pn305: The time interval from the time the servomotor starts until the maximum motor speed is reached.
Pn306: The time interval from the time the servomotor is operating at the maximum motor speed until it stops.
Actual accel/decel time can be calculated with the following equation.
Actual accel time =
Actual decel time =
Target speed
Actual
accel 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.
Speed Reference Filter Time Constant
Pn307
Setting Range
0 to 65535
Setting Unit
1 ms
Setting Unit
1 ms
Target speed
×
Soft start time (accel time Pn305)
Max. speed
Target speed
×
Soft start time (decel time Pn306)
Max. speed
Max. speed
Pn305 Pn306
Setting Unit
0.01 ms
Speed
Factory Setting
0
Speed
Factory Setting
0
Actual
decel time
Speed
Factory Setting
40
5.3 Speed Control
Classification
When Enabled
Immediately Setup
Classification
When Enabled
Immediately Setup
Position Torque
Classification
When Enabled
Immediately Setup
5
5-23