6
4
KEB COMBIVERT F4-C
12
Name: Basis
28.01.98
©
KEB Antriebstechnik, 1997
All Rights reserved
Functional Description
Set Value and Ramp Adjustment
Chapter
Section
Page
Date
Ramp Mode oP.10
f [Hz]
100
50
10
t [s]
5
f [Hz]
100
50
10
t [s]
Constant ascent:
If 0....100Hz are driven in
10s, then 0....50Hz are
driven in 5s.
Constant time:
If 0....100Hz are driven in
10s, then 0....50Hz are
also driven in 10s.
Picture 6.4.6.b
Example for different ramp modi
This parameter defines whether a ramp is adjusted with constant ascent (standard)
or with constant time.
6.4.6
Ramp Generator
The ramp generator assigns an adjustable time to a frequency change, in which the
change shall take place. The acceleration time (for pos. frequency changes) and
deceleration time (for neg. frequency changes) can be set separately for each direction
of rotation. To achieve jerkfree acceleration and deceleration the so-called S-curves
can be adjusted in addition to it.
Coming from the set value limitation the set frequency can be displayed in parameter
ru.6. Converted into speed the value is represented in ru.4. The ramp mode oP.10
decides, how the ramps are calculated. For the ramp with constant ascent (standard)
an S-curve can be adjusted additionally. The set frequency after the ramp generator
is represented in parameter ru.46.
from the set value calculation
ru.6 Set frequency display
ru.4 Set speed display
f x 60
PPZ
oP.10 Ramp mode
Ramp with constant ascent
Ramp with constant time
(only for acceleration)
Ramp with constant time
(only for deceleration)
S-curve calculation
ru.46 Ramp output
frequency
Control processor
Picture 6.4.6.a
Survey of ramp generator
