YASKAWA SGD7S series User Manual

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.
6.5.3 Speed Reference Filter
The speed reference filter is a first order lag filter that is applied to the V-REF (Speed Reference
Input) signal.
You set the speed reference filter in Pn307 (Speed Reference Filter Time Constant).
It is normally not necessary to change this parameter. If the setting is too high, the response to
the speed reference may be slowed down. Monitor the response to the speed reference as you
set this parameter.
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
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 =
Pn307
Speed Reference Filter Time Constant
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 65,535 0.01 ms 40 Immediately Setup
Speed
Position
Torque

YASKAWA SGD7S series Specifications

General

Series	SGD7S
Safety	STO (Safe Torque Off)
Humidity	90% RH or less (non-condensing)
Control Method	PWM Control
Communication	EtherCAT, MECHATROLINK-III, MECHATROLINK-II
Output Power	0.1 kW to 15 kW
Feedback System	Incremental encoder, Absolute encoder
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overload, Overheating, Encoder Error
Ambient Temperature	0 to 55°C
Storage Temperature	-20 to 85°C
Vibration Resistance	5.9 m/s²
Installation	Panel mounted
Certifications	CE, UL, cUL