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S-Curve Speed Command Acceleration/Deceleration:<br />

Set Sn205=3 to enable the use of S-Curve speed <strong>com</strong>mand ac/deceleration function.<br />

Parameter Name Default Unit Setting range Control mode<br />

Sn208<br />

Sn209<br />

Sn210<br />

S-Curve speed <strong>com</strong>mand<br />

accel/decel time setting<br />

S-Curve speed <strong>com</strong>mand<br />

acceleration time setting<br />

S-Curve speed <strong>com</strong>mand<br />

deceleration time setting<br />

1 msec 1~1000 S<br />

200 msec 0~10000 S<br />

200 msec 0~10000 S<br />

In applications where normal acceleration/deceleration on ramp up or ramp down bring in vibration of the<br />

mechanical system. S- curve acceleration/deceleration parameters could help to reduce vibration as<br />

diagram below:<br />

Speed Command (rpm)<br />

ts=Sn208<br />

ta=Sn209<br />

td=Sn210<br />

ts<br />

ta<br />

ts<br />

ts<br />

td<br />

ts<br />

Time (ms)<br />

Caution! Setting Rule:<br />

t<br />

a<br />

2<br />

> t<br />

s<br />

,<br />

s<br />

t d t ><br />

2<br />

5-16

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