Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 88)

Function library
Selection of control mode, optimisation of operating behaviour
7−17
L
EDB82MV752 EN 5.2
7.2.4 Skip frequencies
Description
With certain output frequencies, mechanical resonances might occur (e. g. fan).The skip frequencies
suppress these unwanted output frequencies. The bandwidth (
nf) determines the skip frequency
range.
The function is in the block NSET1 before the ramp function generator.
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0625* Skip frequency 1 0.00 0.00 {0.02 Hz} 650.00
^ 7−17
C0626* Skip frequency 2 0.00 0.00 {0.02 Hz} 650.00
C0627* Skip frequency 3 0.00 0.00 {0.02 Hz} 650.00
C0628* Bandwidth of skip
frequencies 0.00 0.00 {0.01 %} 100.00 Applies to C0625, C0626, C0627
Adjustment
)
Note!
l Skip frequencies only effect main setpoints.
l C0625, C0626, C0627, C0628 are the same for all parameter sets.
·
Set the required skip frequencies under C0625, C0626, C0627.
·
C0628 defines the bandwidth for skip frequencies.
– Calculation of bandwidth (
Ff) for the respective skip frequency:
Df [Hz] + 2 @ f
s
[Hz]
@
C0628 [%]
100 %
f
s
Skip frequency
C0627
C0626
C0625
f
in
f
out
- f = 2 x C0625 x C0628
100 %
- f = 2 x C0626 x C0628
100 %
- f = 2 x C0627 x C0628
100 %
8200vec525
Fig. 7−4 Effect of the skip frequencies
f
in
Input frequency of the function
f
out
Output frequency of the function