Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - Analog Voltage and Pulse Train Reference - Manual (Page 140)

5 Operation
5.3.3 Soft Start
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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.
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: 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.
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.
Pn305
Soft Start Acceleration Time
Classification
Setting Range Setting Unit Factory Setting When Enabled
0 to 10000 1 ms 0 Immediately Setup
Pn306
Soft Start Deceleration Time
Classification
Setting Range Setting Unit Factory Setting When Enabled
0 to 10000 1 ms 0 Immediately Setup
Speed reference
Motor speed
Analog
Speed
Speed
Pn305 Pn306
Actual accel time = Soft start time (accel time Pn305)
Target speed
Max. speed
Target speed
Max. speed
×
Actual decel time = Soft start time (decel time Pn306) ×
Max. speed
Target speed
Actual
decel time Actual
accel time
Analog
Pn307
Speed Reference Filter Time Constant
Classification
Setting Range Setting Unit Factory Setting When Enabled
0 to 65535 0.01 ms 40 Immediately Setup
Speed Position Torque