Section 5: Configuration of the frequency converter
5.10. Elimination of frequencies
In order to eliminate undesirable output frequencies that can cause drive
resonances, 3 ranges called ''ranges of elimination" can be defined. They are
defined by parameters:
par 1.90 – bottom frequency of the elimination band 1 [Hz]
par 1.91 – top frequency of the elimination band 1 [Hz]
par 1.92 – bottom frequency of the elimination band 2 [Hz]
par 1.93 – top frequency of the elimination band 2 [Hz]
par 1.94 – bottom frequency of the elimination band 3 [Hz]
par 1.95 – top frequency of the elimination band 3 [Hz]
Referencing-unit of the electric drive will "bypass" frequencies which are
chosen by the above-mentioned parameters.
Fig.5.6 shows the influence of elimination ranges on the output frequency of
the referencing-unit.
Note:
During acceleration and deceleration, the frequency range elimination function
is inactive.
f before elemination
f ref.
1.90
1.91 1.92
1.93
1.95
1.94
Parameters 1.90 ... 1.95
Fig
. 5.6.Elimination bands - sample configuration. Bands
2 and 3 overlap
40
TWERD Power Electronics
