YASKAWA AC Drive GA700 High Performance Type Technical Manual
Use S-curve characteristics to smooth acceleration and deceleration and to minimize abrupt shock to the load.
Set S-curve characteristic time during acceleration/deceleration at start and acceleration/deceleration at stop.
The following figure explains how S-curves are applied.
If STPo [Motor Step-Out Detected] occurs when starting a PM motor, try increasing the value set to C2-01.
Setting the S-curve will increase the acceleration and deceleration times.