8400 BaseLine D | Software Manual
Motor control (MCTRL)
DC-injection braking
104 L Firmware 03.00 - DMS EN 5.0 - 07/2009
5.6.3 Oscillation damping
Undesirable effects in every process are mechanical oscillations which may have an
adverse effect on the single system components and/or the production output.
Mechanical oscillations in the form of speed oscillations are suppressed by the oscillation
damping function.
Oscillation damping is successfully used with
unloaded motors (no-load oscillations)
motors with a different rated power than that of the controller, e.g. at operation with
high switching frequency and the related power derating.
operation with higher-pole motors
operation with special motors
compensation of resonances in the drive
– Some asynchronous motors can show resonances at an output frequency of approx.
20 ... 40 Hz which cause current and speed variations and thus destabilise the
running operation.
How to eliminate speed oscillations:
1. Approach the area where the speed oscillations occur.
2. Reduce the speed oscillations by changing C234
and C235 step by step.
3. These can be indicators for smooth running:
• Constant motor current characteristic
• Reduction of the mechanical oscillations in the bearing seat
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