YASKAWA E-7-Series SGD7S - Soft Start Settings

6.5 Speed Control
6.5.2 Soft Start Settings
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6.5.2 Soft Start Settings
The soft start function takes a stepwise speed reference input and applies the specified accel-
eration/deceleration rates to convert it to a trapezoidal speed reference.
You specify the acceleration/deceleration rates in Pn305 (Soft Start Acceleration Time) and
Pn306 (Soft Start Deceleration Time).
Use this function to perform smoother speed control (including internal set speed control).
Pn305: The time required for the Servomotor to accelerate from a stopped state to the maxi-
mum motor speed.
Pn306: The time required for the Servomotor to decelerate from the maximum motor speed to
a stopped state.
You can calculate the actual acceleration/deceleration times with the following formulas.
Pn305
Soft Start Acceleration Time
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 10,000 1 ms 0 Immediately Setup
Pn306
Soft Start Deceleration Time
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 10,000 1 ms 0 Immediately Setup
When Enabled
Meaning
Analog
Speed
Speed
Pn305
Pn306
Actual
deceleration
time
Actual
acceleration
time
Target speed
Maximum speed
Maximum speed
Target speed
× Soft start deceleration time (Pn306)
Actual deceleration time =
× Soft start acceleration time (Pn305)
Maximum speed
Target speed
Actual acceleration time =
Analog