Function library
Selection of control mode, optimisation of operating behaviour
7−16
L
EDB82MV752 EN 5.2
7.2.3 Oscillation damping
Description
Suppression of idling oscillations when:
the rated power of controller and motor of a drive do not match, e.g. at operation with high
switching frequency and the related power derating
Operation of higher−pole motors
Operation of special motors
Compensation of resonances in the drive
Some asynchronous motors can show this behaviour when being operated with an output
frequency of approx. 20...40Hz. As a result, operation can be instable (current and speed
fluctuations).
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0079 Oscillation damping 2 0 {1} 140 7−16
Adjustment
1. Approach with speed oscillations.
2. Reduce the speed oscillations by changing C0079 step by step. Additional indicators for
smooth running can be:
– uniform motor current
– reduction of mechanical vibrations in the bearing seat
) Note!
Compensate the resonances in speed−controlled operation via the parameters of
the controller only.
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