Lenze 8615E - Manual (Page 78)

Code Name Parameter setting is printed in bold) Acceptance
CO26 Constant for -1 -2-, ON-LINE
C O 2 5 ( p r e s e l e c t i o n o f t h e a n a l o g i n p u t s ) :
xxxx factory setting
-1000
= -1 o-,
( p r e s e l e c t i o n o f t h e d i g i t a l - f r e q u e n c y
encoder inputs):
512 or
1024 or increments/revolution
-3- 2048 or
-4- 4096 or
Adjustment for CO25
C O 2 5 ( p r e s e l e c t i o n o f t h e a n a l o g i n p u t s ) :
1 .ooo - 2 . 5 0 0 ( 0 . 0 0 1 )
( p r e s e l e c t i o n o f t h e d i g i t a l - f r e q u e n c y
encoder inputs):
1 .ooo - 5 . 0 0 0 ( 0 . 0 0 1 )
4.3 Frequency control
For applications where the act. value is directly proportional
to the of the drive (actual it is advantageous to pilot-
control the output frequency with the or act. value. The
influence of the PI controller be limited such that only the
maximum machine to be expected is
control
A control of the output frequency with the offers the
advantage that the drive accelerate unexpectedly if the act.
value fails failure). The ramp generator for the
must be set correspondingly so that the drive is able to
follow setting as for frequency control).
value control
When the output frequency is pilot-controlled using the act. value,
the machine is supplied with the
frequency
corresponds to the actual without the influence of the Pl
controller (output 0). The Pl controller is only activated
if and act. value are not identical. When the Pl
controller increases or decreases the output frequency, a torque is
generated in the machine so that the drive accelerates in the
desired
The advantage of act. value pilot control is that the
slew
rate does not have to be limited = 0) and that the drive
run through a large setting range with the set torque
according to the set influence of the Pl controller.
A disadvantage is that the drive may accelerate unexpectedly in
the
of inadequate gain of the actual value.
If you want to use the act. value control, first the act.
value gain with pilot control. After successful adjustment
you then to act. value control.
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