6
4
KEB COMBIVERT F4-C
14
Name: Basis
28.01.98
©
KEB Antriebstechnik, 1997
All Rights reserved
Functional Description
Set Value and Ramp Adjustment
Chapter
Section
Page
Date
oP.11
t [s]
oP.15
oP.15
oP.12
oP.16
oP.16
oP.17
oP.13
oP.17
oP.18
oP.14
oP.18
70
70
0
For some applications it is an advantage when the drive starts and stops without
jerks. This is achieved by rounding the acceleration and deceleration ramps. This
rounding time, also called S-curve time, can be adjusted with the parameters
oP.15...oP.18. However, S-curves are performed only with the adjustment „Ramp with
constant ascent“.
S-curve time
+f [Hz]
-f [Hz]
Direction of rotation
forw
ard
Direction of
rotation re
v
erse
Picture 6.4.6.e
S-curve time
oP.11
acceleration time forward
oP.12
deceleration time forward
oP.13
*
1
acceleration time reverse
oP.14
*
1
deceleration time reverse
oP.15
S-curve time acceleration forward
oP.16
*
2
S-curve time deceleration forward
oP.17
*
1
S-curve time acceleration reverse
oP.18
*
1
S-curve time deceleration reverse
In order to drive defined ramps with activated S-curve time, the preadjusted acceleration or deceleration
times (op.11...oP.14) must be longer than the appropriate S-curve times (oP.15...oP.18).
Example for accelerating in direction of rotation forward
At the beginning and the end of an acceleration ramp a parabolic curve is driven for the time adjusted in parameter oP.15.
Therefore the adjusted ramp time is increased by oP.15.
*1
If the value „off“ is adjusted in these parameters (for direction of rotation reverse) then the adjusted values in the
parameters for direction of rotation forward are valid.
*2
If, in addition to the parameters oP.17 and oP.18 (S-curve time for direction of rotation reverse), the value „off“ is
adjusted in parameter oP.16, then the value adjusted in parameter oP.15 is valid for all S-curve times.
Entire acceleration time = acceleration ramp (oP.11) + S-curve time acceleration (oP.15)
