Lenze 4800 Manual page 121

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Configuration
7-30
48XX/49XXSHB0399
Normalization of digital frequency inputs
If the digital frequency inputs X5 and X9 are not assigned to the function setpoint
or act. value encoder - depending on the configuration - they can be assigned to
a function according to the selection under C146.
The input frequency is normalized via C026, C027 and C028.
Procedure:
1. Depending on the max. input frequency:
Selection C026
-5-
-4-
-3-
-2-
2. Numerator and denominator of the normalization factor:
( Numerator = 1024 / 2
- For (C026): Enter the section number (see table above)
( Denominator = Input frequency [kHz];
The value entered corresponds to 100% setpoint
3. Detection of C027 and C028:
Divide numerator and denominator of the normalization factor by a adaptation
factor for both to get setting values for C027 and C028 in a range that is accepted
by the controller.
Example:
Max. input frequency = 9 kHz
1. C026 = -5- (256 incr./rev.)
2. Normalization factor:
( Numerator = 1024 / 2
( Denominator = 9.0
3. Adaptation factor = 10; setting value C027 = 3.2; setting value C028 =
0.9
The adaptation factor should be as low as possible because of the internal
resolution.
corresponds to incr./rev.
256
512
1024
2048
(C026)
5
= 32.0;
f [kHz]
input
< 60
< 120
< 240
> 240