Delta Electronics ASDA-B Series Manuale Utente

Chapter 6  Control Modes of Operation|ASDA-B Series 

Revision January, 2009 

 

 

6-11 

The command source is selected according to the state of SPD0, SPD1 and parameter P1-01 (S or Sz). 

Whenever the command signal needs to be more smoothly, we recommend the users to use S-curve 

and low-pass filter. 
 

The S-curve filter is a speed smoothing command which provides 3 steps accel / decel S-curve to 

smooth the speed command change of the motor during acceleration and deceleration. Using S-curve 

filter can let the servo motor run more smoothly in response to a sudden speed command change. 

Since the speed and acceleration curve are both continuous, in order to avoid the mechanical 

resonance and noise may occur due to a sudden speed command (differentiation of acceleration), using 

S-curve filter not only can improve the performance when servo motor accelerate or decelerate but also 

can make the motor run more smoothly. S-curve filter parameters include P1-34 Acceleration Time 

(TACC), P1-35 Deceleration Time (TDEC) and Accel /Decel S-curve (TSL), and the users can use these 

three parameters to improve the motor performance during acceleration, deceleration and operation. 

ASDA-B series servo drives also support the time calculation of completing speed command. T (ms) is 

the operation (running) time. S (rpm) is absolute speed command, i.e. the absolute value (the result) 

after starting speed subtracts the final speed. 

0

TSL/2

TDEC

TSL/2

TSL/2

TACC

TSL/2

0

S-curve characteristics and Time relationship 

Speed

Rated Speed

Torque

Acceleration

Deceleration

 

 

Relevant parameters: 

Default: 200 

Related Section:  

Applicable Control Mode: S 

P1-35, P1-36, Section 6.3.3 

Unit: ms 

Range: 1 ~ 20000