Speed Damping Factor For Svc - Bosch rexroth EFC 610 Series Operating Instructions Manual

Rexroth Frequency Converter EFC x610
Series

12.5.10 Speed Damping Factor for SVC

Code
Speed observer harmonics damp-
C3.04
ing factor
SVC damp factor enhance upper
C3.54
frequency
SVC damp factor enhance coeffi-
C3.55
cient
C3.04 is a specified parameter for speed observer in sensorless vector control.
It can affect the level of the harmonics, which presents in the observed speed
and is caused by the offset and harmonics of the input values of the speed ob-
server (voltage, current), especially in the speed area below 20% of the rated
motor speed.
The default value of C3.04 can cover most application cases. Only if the motor
runs not smoothly in SVC mode and other control parameters can't help to im-
prove it, C3.04 can be set with a higher value by setting step size 0.3 ~ 0.5.
Please note that high C3.04 has a negative influence on the loading perform-
ance.
C3.54 and C3.55 are used to enhance damping factor in the SVC low speed
area. Normally, only increasing C3.54 can satisfy the need of enhancing the
damping factor. But C3.54 can not be too high, otherwise speed fluctuation will
occur. Now C3.55 can be used, increasing C3.55 also can enhance the damping
factor.
Name
0.10...20.00
DOM
1...20
Functions and Parameters
Setting range Default
0.66
DOM
1
R912005854_Edition 09 Bosch Rexroth AG
193/653
Unit Step Attri.
- 0.01 Stop
Hz 0.01 Stop
- 1 Stop