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User Manual - CNC4PC

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5-3-6 Smoothing the speed command<br />

Sn205 can be used to eliminate speed overshoot and motor vibration by selecting one of the<br />

acceleration /deceleration methods which is suitable for the application from the table below.<br />

Parameter Name Setting Description<br />

Sn205<br />

Speed<br />

command<br />

accel/decel<br />

smooth<br />

method<br />

0 Disable accel/decel smooth function<br />

1 Smooth accel/decel according to parameter Sn206<br />

2 Linear accel/decel according to parameter Sn207<br />

3 S-curve accel /decel according to parameter Sn208<br />

Control<br />

mode<br />

S<br />

Above three methods of Acceleration/deceleration are described below.<br />

(1)Speed command smooth ac/deceleration:<br />

Set Sn205=1 to enable the use of speed command smooth acceleration/deceleration function.<br />

Parameter Name Default Unit Setting range<br />

Sn206<br />

Speed command smooth<br />

accel/decel time Constant<br />

Control<br />

mode<br />

1 msec 1~10000 S<br />

Smooth acceleration/deceleration time corresponds to the time in which the speed command increases from 0 to<br />

63.2% as shown in diagram below.<br />

5-14

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