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KEB COMBIVERT F5-M / S
18
Name: Basis
12.05.04
Chapter
Section
Page
Date
©
KEB Antriebstechnik, 2002
All Rights reserved
Functional Desription
Setpoint- and Ramp Adjustment
Fig. 6.4.9.c Graph with ramp modes
Calculations
The speed change per raster scan delta_t (step size delta_n) for the mode constant
ascent is calculated from the ramp time t_ramp and the reference speed (1000
rpm) as follows:
1000 rpm
delta_n=
ó ó ó ó ó ó ó ó ó
t_rampe / delta_t
For different set values the real ramp time is calculated according to following
formula:
n_soll
t = t_rampe *
ó ó ó
1000 rpm
The actual step size for the mode constant time is calculated from the step size
delta_n and the actual set value n_set as follows:
n_soll
delta_n(variable) = delta_n * ó ó ó ó
1000 rpm
For a simplification of the internal calculations 1024 min
-1
(resp. 2048 min
-1
or
4096 min
-1
dependent on ud.2) are used as reference speed.
n_set
delta_n(variable) = delta_n *ó ó ó ó ó
1024 rpm
-1
This results in an error of -2.4 % for the real ramp time. If a specific real ramp time
shall be adjusted, the desired value is to be divided by 1.024. Example:
desired ramp time = 10 s
adjsuted ramp time = 10 s / 1.024 = 9.77 s
delta_f
konstant
delta_t
delta_f
konstant
delta_t
delta_f
konstant
delta_t
delta_f_2
variabel
delta_t
delta_f_1
variabel
delta_t
t_rampe
t_1
f_1
t
t_2
f_2
f_soll
100 Hz
n_soll
n_2
1000 rpm
n_1
delta_n
konstant
delta_n
konstant
delta_n_2
variabel
delta_n_1
variabel
delta_n
konstant