KEB COMBIVERT F5 BASIC Applications Manual page 243

Special Functions
6.9.9 Positioning
Function
(only at F5-G/B)
Calculation of the frequency-
dependent constant running
Positioning delay (Pn.63)
Waiting period after reaching the
position (fr.6)
Used Parameters
R/W PROG.
Param. Addr.
Pn.63 043Fh
Fr.5 0905h
Fr.6 0906h
© KEB Antriebstechnik, 2002
All rights reserved
The positioning function enables the approach of a position with a signal from different
frequencies. The positioning procedure is triggered by disabling the direction of rotation
through an external signal (e.g. through set-changeover). The positioning is executed
correctly only if at triggering the positioning the maximum frequency of the positioning
set is not exceeded and no s-curves are used. During the positioning procedure the
status 'Positioning' is displayed (value 83, display 'POSI').
In order to always travel the same distance in the case of different frequencies, the
drive continues to run with constant frequency after starting the positioning until the
time position is reached with the adjusted deceleration. The frequency-dependent constant
running time is calculated as follows:
t_dec
t_const = ———————— •
Reference frequency
t_const: frequency-dependent constant running time [sec.]
t_dec: adjusted deceleration time [sec.]
Reference frequency: 100Hz / 200Hz / 400Hz (dependent on ud.2)
f_max: maximum frequenz [Hz]
f_actual: actual frequency[Hz] on triggering the positioning
With parameter Pn.63 a shifting of the stop position can be adjusted, which entails an
additional constant running time. Thus the shifting of the initiator can be omitted. The
additional constant running time is also frequency-dependent and is calculated as
follows:
Pn.63 • f_max
t_delay = ——————
f_actual
The parameter is not standardized and can be adjusted within the range of 0.01...327.67 s.
The value -1 switches off the positioning function in the appropriate set.
Pn.63 Function
-0,02 Positioning function switched on; no shifting of the stop function;
set changeover during the positioning possible
-0,01 Positioning function switched off (standard)
0,00...327,67 s Positioning function switched on; positioning delay by the adjusted
value, set changeover during the positioning not possible .
As the positioning is usually triggered by a pulse signal, the set-changeover during
the positioning procedure is disabled. The set switch-off delay (fr.6) starts only after
the positioning is completed.
ENTER
max
min
-1 s 326,76 s
- 0,00 s 2,55 s
- 0,00 s 2,55 s
Name: Basis
KEB COMBIVERT F5
Functional Description
2 f_max²
(
——— - f_actual
f_actual
t_delay: additional constant running time [sec.]
Pn.63: positioning / delay [sec.]
f_max: maximum frequency [Hz]
f_actual: actual frequency [Hz] on triggering the positioning
Step
default
0,01 s -0,01 s
0,01 s 0,00 s
0,01 s 0,00 s
)
-0,01 = off; -0,02= abort
-
-
Date Chapter Section
6 9
18.04.02
6
Page
31