6
4
15
KEB COMBIVERT F5-M / S
Name: Basis
12.05.04
Section
Page
Date
©
KEB Antriebstechnik, 2002
All Rights reserved
Chapter
Functional Desription
Setpoint- and Ramp Adjustment
6
oP.28
t [s]
oP.32
oP.32
oP.30
oP.34
oP.34
oP.33
oP.29
oP.33
oP.35
oP.31
oP.35
-1000
1000
0
For some applications it is of advantage if the drive starts and stops nearly jerk-
free. This function is achieved by straightening the acceleration and deceleration
ramps. The straightening time, also called S-curve time, can be preadjusted with
the parameters oP.32...oP.35. But S-curves are excecuted only with the adjustment
ÑRamp with constant riseì.
S-curve time
+n [rpm]
-n [rpm]
Fig. 6.4.6.a S-curve time
Rotation direction
forward
Rotation direction
reverse
oP.28
Acceleration time forward
oP.29
*
1
Acceleration time reverse
oP.30 *
2
Deceleration time forward
oP.31
*
1
Deceleration time reverse
oP.32
S-curve time acceleration forward
oP.33
*
1
S-curve time acceleration reverse
oP.34
*
3
S-curve time deceleration forward
oP.35
*
1
S-curve time deceleration reverse
*1
If the value ÑForì is adjusted in these parameters (for rotation direction reverse), then the values adjusted in the parameters
for rotation direction forward are valid.
*2
If the value ÑAccì is adjusted in this parameter, then the value for acceleration (oP.28) is valid.
*3
If the value ÑAccì is adjusted in this parameter, then the value adjusted in parameter oP.32 is valid for all S-curve times.
Value Ñ0ì switches the corresponding S-curve off.
In order to drive defined ramps with activated S-curve time, the preadjusted
acceleration and deceleration times (oP.28...oP.31) must be larger than the
S-curve time (oP.32...oP.34) belonging to it.
At the beginning and the end of the acceleration ramp a parabolic curve is driven
for the time adjusted in parameter oP.32. As a result the adjusted ramp time is
extended by oP.32.
Total acceleration time = oP.28 + oP.32
Example for acceleration with
rotation direction forward